Streaming devices / Compare

onn. 4K Pro Streaming Device (2026) vs Roku Ultra (2024)

A

Product A: onn.

4K Pro Streaming Device (2026)

47 of 97 known

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B

Product B: Roku

Ultra (2024)

62 of 97 known

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All 97 fields

Every value links to where we found it.

Only differences

Aonn. 4K Pro Streaming Device (2026)

BRoku Ultra (2024)

General

5 of 8 differ

Series

Not available

Ultra2Press releaseroku.com/blog/new-roku-ultraRead 7 October 2026Exact 2024 Roku Ultra launch, describing successive Ultra devices.

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

JS620K42Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 2026Single-page unfolded maker QSG labels JS620K4 and document 36017107WT_EN_251114. Body drawings match the 2026 oval unit. Retail model 36017107 is not inferred from the document code.

4850R, 4850X1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Exact retail product details list Model 4850R. Developer model identifier 4850X is separately sourced. Not older 4800/4802 or Walmart LT.3Maker product pagedeveloper.roku.com/dev/docs/hardwareRead 7 October 2026Current hardware table names Ultra Brewster 4850X, 2024. Software hardware identifier alongside retail SKU 4850R.

GTIN / EAN

Not available

8296100068889Retailer pageabt.com/Roku-Ultra-4K-Streaming-Device-2024-4850R/p/213248.htmlRead 7 October 2026Exact 4850R product header UPC 829610006888.

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

Not available

24 September 20242Press releaseroku.com/blog/new-roku-ultraRead 7 October 2026Dated September 24, 2024.

Status

Available1Maker product pagewalmart.com/ip/18382213962Read 8 October 2026Exact NEW 2026 listing. Current fulfillment context says out of stock. This is released lifecycle availability, not a stock promise.

Available3Maker product pagedeveloper.roku.com/dev/docs/hardwareRead 7 October 2026Current models table explicitly manufactured and supported. Current product is for sale, so available.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

onn. 4K Pro Streaming Device (2024)13Press articleaftvnews.com/2026-onn-4k-pro-and-onn-4k-stick-benchmarks-the-pro-gets-a-much-needed-power-up-and-the-stick-holds-its-ownRead 23 October 2026AFTVnews calls the 2026 model the 2nd-gen onn 4K Pro and says it replaces the 1st-gen onn 4K Pro.

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$59.987Reviewandroidauthority.com/onn-4k-pro-2026-review-3677202Read 8 October 2026June 20 review lists MSRP $59.98 for exact 2026 model. Earlier isolated purchaser paid $59.88, a transaction price rather than a conflicting MSRP.

$99.992Press releaseroku.com/blog/new-roku-ultraRead 7 October 2026Availability explicitly $99.99 in US. US pre-tax MSRP, separate from Canadian price or later sales.

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

Not available

Not available

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

US, PR1Maker product pagewalmart.com/ip/18382213962Read 8 October 20262Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 2026Cover explicitly excludes Google TV apps, content and features outside U.S. and Puerto Rico. Illustrative Canada setup screen does not override this restriction.

US2Press releaseroku.com/blog/new-roku-ultraRead 7 October 2026Launch US availability and current US 4850R reference. Canadian retail identifier not proved, so no CA variant inherited.

ColoursiThe maker's own colour names

Black, Gray1Maker product pagewalmart.com/ip/18382213962Read 8 October 2026Maker names Black and Gray. Black 3 GB/32 GB model is the reference and photograph.

Black9Retailer pageabt.com/Roku-Ultra-4K-Streaming-Device-2024-4850R/p/213248.htmlRead 7 October 2026Exact 4850R listing names Black Finish. No arbitrary finish variants added.

Form factoriA stick plugs straight into the HDMI port. A dongle hangs from its own short fixed HDMI lead. A box stands on its own and connects by a separate cable.

Box7Reviewandroidauthority.com/onn-4k-pro-2026-review-3677202Read 8 October 2026

Box8Reviewtomsguide.com/tvs/roku-ultra-2024-reviewRead 7 October 2026Exact 2024 review repeatedly identifies small box, separate from sticks.

Video output

7 of 11 differ

Max output resolutioniHighest published video output resolution. Decoder capability and app streaming quality do not establish the output resolution.

3840 × 2160px1Maker product pagewalmart.com/ip/18382213962Read 8 October 2026Maker 4K Ultra UHD output claim. No chipset-derived 4K75 ceiling inherited.

3840 × 2160px1Maker product pageroku.com/products/roku-ultraRead 7 October 2026TV compatibility: up to 2160p at 60 fps (3840 x 2160). This is HDMI output, not UI rendering resolution.

Max output refresh rateiHighest published output refresh rate. Resolution, HDR and connection conditions belong in the source note. This is not a television panel refresh rate.

Not available

60Hz1Maker product pageroku.com/products/roku-ultraRead 7 October 2026TV compatibility explicitly up to 2160p at 60 fps and Dolby Vision at 60 fps. Requires compatible HDMI/HDCP chain. No higher UI/TV rate imported.

Video output modesiPublished video output combinations. A row records support, not a proved maximum at every lower resolution. Keep HDR, chroma and bit depth conditions in source notes.

Aonn. 4K Pro Streaming Device (2026)

Not available

BRoku Ultra (2024)

Width (px)	Height (px)	Refresh rate (Hz)	HDR format
3840	2160	60	Dolby Vision

Source1Maker product pageroku.com/products/roku-ultraRead 7 October 2026TV compatibility explicitly supports Dolby Vision at 60 fps on 4K HDR TVs. Native 3840 x 2160 output. Bit depth/chroma unproved.

HDR formats

HDR10, HDR10+, Dolby Vision8Press articleflatpanelshd.com/news.phpRead 8 October 2026May 6 exact new Pro report explicitly lists HDR10, HDR10+ and Dolby Vision. Not a 2024 Pro or Plus column.

HDR10, HDR10+, Dolby Vision, HLG1Maker product pageroku.com/products/roku-ultraRead 7 October 2026TV compatibility explicitly lists Dolby Vision, HDR10/10+ and HLG. Compatible content, TV and HDMI chain required.

Dolby Vision profilesiPublished supported Dolby Vision profiles and levels. Streaming support does not prove local-file support.

Not available

Not available

HDMI versioniPublished HDMI output revision. A revision does not establish every optional HDMI feature.

Not available

2.1b1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Ports table explicitly HDMI 2.1b. Optional features are not inferred from revision.

HDCP version

Not available

2.21Maker product pageroku.com/products/roku-ultraRead 7 October 20264K compatibility requires an HDMI input supporting HDCP 2.2. Stored supported 4K-chain version, not a claim of a newer maximum.

HDMI-CEC

Not available

Yes7Owner's manualsupport.roku.com/en-us/article/360057488733Read 7 October 2026Exact 4850 compatibility with HomeKit. Player power control requires TV HDMI-CEC and Roku 1-touch-play. Published CEC function, not every CEC optional feature.

Automatic frame rate matchingiCan switch the video output rate to match content. App, operating system and playback restrictions belong in the source note.

Yes10Reviewblog.lon.tv/2026/05/10/new-onn-4k-pro-streaming-box-review-2026-versionRead 8 October 2026Own purchased 2026 unit switches frame rate in some apps, including Netflix. Disney Plus and Apple TV did not switch to 24p in this test. Firmware and television model are unreported. No universal app guarantee.

Yes2Press releaseroku.com/blog/new-roku-ultraRead 7 October 2026Exact 2024 launch explicitly HDMI 2.1 Quick Media Switching between refresh rates/content sources. Official auto-adjust article supplies native-content matching settings and app restrictions.12Owner's manualsupport.roku.com/article/change-the-refresh-rateRead 7 October 2026Roku auto-adjust display refresh switches to source native rate on compatible players. Exact 2024 launch additionally establishes QMS switching. Some apps including Netflix/Hulu exclude auto-adjust. Enable in Advanced display settings. QMS requires compatible TV, no implied universal app support.

Dynamic range matchingiCan switch the output dynamic range to match SDR or HDR content. App and firmware restrictions belong in the source note.

Not available

Not available

UpscalingiNamed video upscaling modes. Record source resolution and output restrictions in source notes.

Not available

720p to 1080p, 720p to 2160p, 1080p to 2160p1Maker product pageroku.com/products/roku-ultraRead 7 October 2026TV compatibility separately names upscaling 720p to 1080p and 720p/1080p to 2160p. No named AI processing invented.

Video decoding

3 of 4 differ

Video codecsiExplicitly supported video decoding formats. Use names such as H.264, HEVC, AV1 and VP9. Chip capabilities alone do not prove device playback support.

AV1, VP9, H.264, HEVC9Spec databaseandroidtv-guide.com/streaming-gaming/onn-walmart-4k-pro-js620k4Read 8 October 2026Exact-device record explicitly lists AV1, VP9, H.264 and H.265. No codec profiles, levels, containers or chipset decoding ceilings inherited.

H.264, HEVC, VP9.2, AV11Maker product pageroku.com/products/roku-ultraRead 7 October 2026USB media formats explicitly H.264/AVC, H.265/HEVC, VP9.2 and AV1. Local USB route and listed container restrictions, no generic chip capability inherited.

Video decode limitsiPublished supported decoding limits. Profiles, levels and playback route matter. Output resolution and service support are separate.

Not available

Not available

Video containersiExplicitly supported local playback containers. App requirements belong in the source note.

Not available

MKV, MP4, MOV1Maker product pageroku.com/products/roku-ultraRead 7 October 2026USB video playback table lists MKV, MP4 and MOV. VP9.2 only MKV, AV1 MP4/MKV, AVC and HEVC all three. This is local playback, not every streaming protocol.

DRM systemsiNamed supported DRM systems and security levels. DRM certification does not prove a particular service streams at 4K.

Widevine L19Spec databaseandroidtv-guide.com/streaming-gaming/onn-walmart-4k-pro-js620k4Read 8 October 2026Record specifies Widevine L1. DRM alone does not establish any service's streaming quality.

Not available

Audio

4 of 8 differ

Audio formatsiPublished supported audio formats. Decoder, output and passthrough roles are qualified in source notes.

Dolby Atmos1Maker product pagewalmart.com/ip/18382213962Read 8 October 2026Dolby Atmos support needs compatible content, app and HDMI audio equipment. Carrier, lossless passthrough and channel ceiling are unproved.

AAC, MP3, WMA, FLAC, PCM, AC3, EAC3, DTS Digital Surround, ALAC, HE-AAC, AC-4 with Atmos, EAC3 with Atmos1Maker product pageroku.com/products/roku-ultraRead 7 October 2026USB audio format table lists each stored format. DTS is passthrough, Atmos is via AC-4/EAC3 in listed local containers and HDMI with compatible sound equipment. Decode versus passthrough qualified separately.

Audio passthrough formatsiCompressed formats explicitly passed to external audio equipment without decoding. Dolby Atmos support alone does not establish TrueHD passthrough.

Not available

DTS Digital Surround, AC3, EAC31Maker product pageroku.com/products/roku-ultraRead 7 October 2026Audio features explicitly DTS Digital Surround pass through over HDMI. AC3/EAC3 passthrough separately sourced from official streaming specification. No TrueHD/DTS-HD inference.4Maker product pagedeveloper.roku.com/dev/docs/mediaRead 7 October 2026Supported audio notes explicitly AC3/EAC3 passthrough to receiving device, separately names Brewster 4850X Dolby support. DTS passthrough also explicit. No lossless-format support inferred.

Dolby AtmosiExplicit device support for Dolby Atmos. Codec, service, app and output requirements belong in the source note.

Yes1Maker product pagewalmart.com/ip/18382213962Read 8 October 2026

Yes1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Audio features explicitly Dolby Atmos decode via HDMI, with compatible speakers. USB audio table names AC-4 and EAC3 Atmos, not TrueHD passthrough.

Audio channel configurationsiPublished output configurations, such as 2.0, 5.1 or 7.1. Keep PCM and compressed audio routes separate in source notes. Dolby Atmos support alone does not establish a channel configuration.

Not available

2.01Maker product pageroku.com/products/roku-ultraRead 7 October 2026Audio features explicitly list Digital stereo over HDMI, stored as 2.0. No inferred PCM multichannel output.

Max audio sample rateiHighest published audio output sample rate. Keep playback route and format in source notes.

Not available

Not available

Max audio bit depthiHighest published audio output bit depth. Keep playback route and format in source notes.

Not available

Not available

Bluetooth audio output

Not available

Yes1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Bluetooth Headphone Mode explicitly pairs headphones directly to Ultra. Bluetooth input streaming is separate and not used as output proof.

Bluetooth audio codecsiExplicitly supported codecs for audio sent to Bluetooth headphones or speakers. Bluetooth version alone is not proof.

Not available

Not available

Processor and memory

7 of 11 differ

System on chip

Amlogic S905X5M8Press articleflatpanelshd.com/news.phpRead 8 October 20269Spec databaseandroidtv-guide.com/streaming-gaming/onn-walmart-4k-pro-js620k4Read 8 October 2026

Not available

CPU

Quad-core ARM Cortex-A553Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026Readable original 2026 manufacturer packaging photograph names quad-core Cortex-A55 and ARM G310 V2. No clock or RAM type appears here.

ARM Cortex-A553Maker product pagedeveloper.roku.com/dev/docs/hardwareRead 7 October 2026Exact Brewster/4850X table: ARM Cortex A55. No SoC/GPU or clock inferred from accelerated graphics API.

CPU cores

43Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026

42Press releaseroku.com/blog/new-roku-ultraRead 7 October 2026Launch explicitly all-new quad core processor. No CPU clock or SoC name stated.

Max CPU clockiHighest explicitly published processor clock for this device. Generic chipset limits are not device evidence.

2.5GHz9Spec databaseandroidtv-guide.com/streaming-gaming/onn-walmart-4k-pro-js620k4Read 8 October 2026Exact JS620K4 / DS9620 / jarvis2 V2 record specifies 2.5 GHz Cortex-A55. This is a device database claim, not a clock measurement.

Not available

GPU

ARM Mali-G310 V23Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026

Not available

RAMiKeep published GB values as stated. Convert a source explicitly labelled MB using 1000 MB per GB and preserve its original figure and unit in the note. Do not assume MB means MiB. Convert explicit MiB or GiB to decimal GB through their byte definitions, recording the conversion in the note. This normalization does not establish an exact physical byte count.

3GB1Maker product pagewalmart.com/ip/18382213962Read 8 October 20263Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026

2GB3Maker product pagedeveloper.roku.com/dev/docs/hardwareRead 7 October 2026Exact Brewster/4850X row explicitly 2 GB. Direct HTTP fetch returns 403. Readable official web-tool cached page independently opened. Access limit recorded.

RAM type

Not available

Not available

StorageiMarketed built-in storage capacity in decimal GB. Free space after the operating system is separate.

32GB1Maker product pagewalmart.com/ip/18382213962Read 8 October 20263Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026

4GB8Reviewtomsguide.com/tvs/roku-ultra-2024-reviewRead 7 October 2026Design explicitly only 4 GB internal storage. Maker is silent. No storage technology or external app-install ability inferred.

Storage type

Not available

Not available

Expandable storageiCan use added removable or external storage to store installed apps or play media directly. Copying files through a USB data connection alone does not qualify. The source note states whether apps, media or both are supported and names the connection and limitations. Storage must be attached to the streaming device. Cloud and network streaming do not qualify.

Yes1Maker product pagewalmart.com/ip/18382213962Read 8 October 2026Maker USB 2.0 port is expressly for media and storage. External media playback is recorded. App installation on USB storage is unproved.

Yes1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Local playback via USB port. True covers additional local media storage only, not adding internal capacity or installing apps on USB.

Storage expansion methodsiPublished methods for adding app or media storage. USB support alone does not prove app installation on external storage.

USB storage for media playback1Maker product pagewalmart.com/ip/18382213962Read 8 October 2026

USB mass storage for local media playback1Maker product pageroku.com/products/roku-ultraRead 7 October 2026USB local playback only. App installation on external media unproved.

Connectivity

2 of 7 differ

Wi-Fi

Wi-Fi 61Maker product pagewalmart.com/ip/18382213962Read 8 October 20263Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026

Wi-Fi 61Maker product pageroku.com/products/roku-ultraRead 7 October 2026Networking explicitly 802.11 ax Wi-Fi 6.

Wi-Fi bands

2.4 GHz, 5 GHz3Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026Maker box states Wi-Fi 6, 2.4/5 GHz, 802.11ax. MIMO stream count is unproved.

2.4 GHz, 5 GHz1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Networking explicitly 2.4 GHz / 5 GHz. No 6 GHz inferred.

Wi-Fi MIMOiWritten as 2x2 MIMO when the maker gives the stream count, or MIMO when it does not. 2T2R counts as 2x2. MU-MIMO support alone does not show more than one stream, so it is not stored. Band wording goes in the source note.

Not available

MIMO1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Networking explicitly dual-band MIMO. Stream/antenna count not published.

Built-in Ethernet speediRated speed of a built-in Ethernet port. An optional USB Ethernet adapter does not count.

100Mbps7Reviewandroidauthority.com/onn-4k-pro-2026-review-3677202Read 8 October 2026Own exact-device review states Ethernet capped at 100 Mbps. Not a measured throughput figure.

100Mbps1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Networking and ports explicitly 10/100 Base-T. Maximum rated built-in link 100 Mbps, not review throughput.

Optional Ethernet adapter supportiExplicit support for an external Ethernet adapter. Required adapter and connection belong in the source note.

Not available

Not available

Bluetooth versioniPublished device Bluetooth version. The remote can use a different Bluetooth version.

Not available

Not available

PortsiPhysical device connectors, including a fixed HDMI plug and power-only USB. Excludes connectors on the remote and optional adapters. Count identical connectors in each row.

Aonn. 4K Pro Streaming Device (2026)

Connector	Count	Version	Role	Data speed (Gbps)
HDMI	1	Not available	Video and audio output	Not available
USB-A	1	USB 2.0	Media storage and peripherals	Not available
USB-C	1	Not available	Power input	Not available
Ethernet	1	Not available	Network	0.1

Source2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 2026Streaming Device panel labels one Ethernet, HDMI, USB 2.0 and power connector. USB connector shapes and roles corroborated by actual-device review.7Reviewandroidauthority.com/onn-4k-pro-2026-review-3677202Read 8 October 2026Own physical inspection identifies USB-C power, HDMI, Ethernet and full-size USB-A. Revision of power-only USB-C is unproved.

BRoku Ultra (2024)

Connector	Count	Version	Role	Data speed (Gbps)
USB-A	1	USB 3.0	Local media playback and remote charging	Not available
HDMI	1	2.1b	Video and audio output	Not available
Ethernet	1	Not available	10/100 Base-T networking	0.1
DC power	1	Not available	Power input	Not available

Source1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Ports inventory USB 3.0, HDMI 2.1b, Ethernet 10/100 and Power. Maker back-view photo confirms one of each. TechRadar independently identifies single HDMI, USB-A and Ethernet. Remote USB-C excluded.

Smart home

3 of 3 differ

Thread border router

Yes4Maker product pagei5.walmartimages.com/seo/4K-PRO-STREAMING_38d24374-0d07-4393-868a-36fb47ad408e.229daefb3c8f41105c623f8d26541c55.pngRead 8 October 2026Exact current 2026 packaging render displays Built on Thread Border Router badge. Matter logo and separate Matter over Thread gallery claim do not prove accessory commissioning, so Matter controller remains unknown.

Not available

Matter controlleriCan commission and control Matter accessories. Acting as a Matter accessory alone does not qualify.

Not available

No8Reviewtomsguide.com/tvs/roku-ultra-2024-reviewRead 7 October 2026Smart-home section explicitly does not adopt any Matter connectivity. Review 2024 hardware, current maker still lists proprietary integrations only. Not inferred from absence in product table.

Smart home platforms

Google Home2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 202612Maker product pagesupport.google.com/googletv/answer/16522213Read 8 October 2026

Roku Smart Home, Apple HomeKit, Google Home, Amazon Alexa1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Compatibility lists Roku Smart Home, Apple HomeKit, Google Home and Alexa. HomeKit is accessory integration, not Matter-controller proof.

Remote control

6 of 9 differ

Remote model

Not available

Roku Voice Remote Pro (2nd edition)1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Remote control and box table explicitly Roku Voice Remote Pro (2nd edition). Original supplied remote, not a later generic replacement.

Remote connectioniEvery wireless link the included remote uses, to the device or to other equipment. An infrared transmitter that controls the TV counts as infrared.

Bluetooth11Press articleandroidpctv.com/walmart-onn-4k-pro-streaming-device-2026Read 8 October 2026Exact 2026 article explicitly identifies included Bluetooth remote. Its uncertain infrared wording and unsupported 4K75/chipset output claims are excluded. Device Bluetooth revision is not independently verified.

Not available

Remote microphone

Yes2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 2026Remote Control panel labels Gemini for TV button and depicts the microphone openings on the supplied voice remote.

Yes5Owner's manualsupport.roku.com/en-us/article/learn-about-voice-remote-proRead 7 October 2026Hands-free and push-to-talk control explicitly described for Voice Remote Pro second edition. Slider green enables voice microphone. No capsule count claimed.

Remote voice assistantsiVoice assistants usable from the supplied remote. Region, language, app and firmware restrictions belong in the source note.

Gemini for TV, Google Assistant2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 202612Maker product pagesupport.google.com/googletv/answer/16522213Read 8 October 2026

Roku Voice2Press releaseroku.com/blog/new-roku-ultraRead 7 October 2026Supplied second-edition remote supports hands-free Hey Roku voice commands and shortcuts. Other assistant integrations require external devices.

Remote TV controliSupported TV controls, such as power, volume and input. Infrared and HDMI-CEC routes are qualified in source notes.

Power, Volume2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 2026Setup 4.7 explicitly names television power and volume. Control route and TV compatibility are unspecified.

Power, Volume, Mute5Owner's manualsupport.roku.com/en-us/article/learn-about-voice-remote-proRead 7 October 2026Second-edition description confirms TV power and volume controls. Its exact diagram includes mute among the shared core buttons. TV compatibility and remote setup affect operation. No input switching implied.

Remote finder

Yes1Maker product pagewalmart.com/ip/18382213962Read 8 October 20262Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 2026Button sounds supplied remote for 30 seconds, at up to 30 ft. Backlit Button Design states illumination after any button press.

Yes1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Product explicitly lost remote finder. Launch describes box-button and hands-free trigger.

Remote backlight

Yes1Maker product pagewalmart.com/ip/18382213962Read 8 October 20262Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 2026

Yes1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Product explicitly backlit buttons on supplied Voice Remote Pro.

Remote poweriPublished batteries or rechargeable battery arrangement for the supplied remote.

2 AAA batteries (included)2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 20263Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026

Built-in rechargeable lithium-ion battery5Owner's manualsupport.roku.com/en-us/article/learn-about-voice-remote-proRead 7 October 2026Charging section explicitly rechargeable lithium-ion battery. Second-edition full charge 5.5 h and typical 3 months remain in source context, not unsupported schema fields.

Remote charging port

Not available

USB-C1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Box includes USB-C cable for remote, and launch explicitly USB-C charging for second edition.2Press releaseroku.com/blog/new-roku-ultraRead 7 October 2026Second-edition remote explicitly convenient USB-C charging.

Software

7 of 8 differ

Operating systemiPlatform name. The launch version is stored separately from later firmware support.

Google TV (Android TV OS)2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 2026

Roku OS6Owner's manualsupport.roku.com/en-us/article/learn-about-ultraRead 7 October 2026Exact 4850 guide Learn about Roku features identifies Roku OS. Launch OS revision unproved.

Operating system at launch

Android TV OS 146Reviewandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_6.jpegRead 8 October 2026Launch-period purchaser screenshot published April 15 displays exact onn 4K Pro Streaming Device, Android TV OS 14 and February 1, 2026 security patch. Current firmware is separate.

Not available

App store

Not available

Roku Streaming Store6Owner's manualsupport.roku.com/en-us/article/learn-about-ultraRead 7 October 2026Exact-model guide includes Roku Streaming Store link in footer and add-app guidance. Current platform store name.

Casting protocolsiPublished casting or screen mirroring protocols. AirPlay and Google Cast are distinct. App-only playback support does not prove system-wide mirroring.

Google Cast3Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026

Apple AirPlay 27Owner's manualsupport.roku.com/en-us/article/360057488733Read 7 October 2026Compatibility table explicitly Ultra 4850 with Roku OS 9.4 or later for AirPlay 2. Apple host requires iOS 12.3 or macOS 10.14.5 or later, same network. Published minimum compatibility is not the launch OS.

Voice assistantsiVoice assistants supported by the device. A remote microphone and hands-free activation are separate features.

Gemini for TV, Google Assistant2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 202612Maker product pagesupport.google.com/googletv/answer/16522213Read 8 October 2026Current Google guidance requires eligible Android 14+/2 GB+ device, supported country/language and account. Gemini AI responses require age 18+ and exclude kids profiles. Non-kids under-18 profiles and devices removed from Google Home use Google Assistant. Google's wider platform rollout does not override this SKU's US/Puerto Rico service restriction.

Roku Voice, Amazon Alexa, Google Assistant, Apple Siri1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Exact model compatibility supports Alexa and Google Home. Footer explicitly requires Alexa-enabled or Google Assistant-enabled external device. Roku Voice via remote, Siri via separate HomeKit support guide. Not onboard Alexa/Google microphones.7Owner's manualsupport.roku.com/en-us/article/360057488733Read 7 October 2026HomeKit section explicitly Siri control via supported Apple device. Basic remote commands via Siri only within AirPlay session. Google Assistant/Alexa integrations require external assistant devices as product footer states. Roku Voice runs from supplied remote.

Hands-free voice controliControl the streaming device by voice without pressing a button. This may use built-in microphones or a compatible linked smart speaker, phone or headset. The source note names the required device, connection, software and supported commands. A microphone on a press-to-talk remote alone does not qualify.

Yes2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 2026Gemini panel requires built-in microphone switch on, hands-free mic enabled in account settings and network access. Hey Google searches entertainment, answers questions and controls linked smart home devices.7Reviewandroidauthority.com/onn-4k-pro-2026-review-3677202Read 8 October 2026Own month-long use confirms working hands-free Gemini with physical microphone switch enabled.12Maker product pagesupport.google.com/googletv/answer/16522213Read 8 October 2026Physical device microphone and account Hands-free mic setting must be enabled. Google Home membership/setup is required for Gemini. Feature availability is current to accessed date and is not guaranteed for every market or profile.

Yes2Press releaseroku.com/blog/new-roku-ultraRead 7 October 2026Supplied second-edition Voice Remote Pro explicitly hands-free commands. Enabled remote microphone slider and nearby remote required.

Mobile remote platforms

Not available

Android, iOS6Owner's manualsupport.roku.com/en-us/article/learn-about-ultraRead 7 October 2026Exact 4850 guide Get the Roku mobile app explicitly iOS and Android for player control. No Windows capability inherited.

Accessibility features

Not available

Text-to-speech screen reader, Closed captioning10Owner's manualsupport.roku.com/en-us/article/enable-the-texttospeech-screen-readerRead 7 October 2026Explicit Roku Ultra support for text-to-speech screen reader in US. Software update may be required. Closed captioning separately linked in exact 4850 guide. No audio-description promise for every app.13Owner's manualsupport.roku.com/en-us/article/turn-on-closed-captioningRead 7 October 2026Roku closed captioning on compatible channel content. Available caption tracks and app settings vary. Exact 4850 guide explicitly links this feature.

Gaming

1 of 2 differ

Game servicesiPublished native or cloud gaming services. Service availability is time-sensitive. Record software and region requirements in source notes.

Not available

Not available

Game controller supportiExplicitly supported controllers or connection methods. Bluetooth alone does not establish game controller support.

USB game controllers7Reviewandroidauthority.com/onn-4k-pro-2026-review-3677202Read 8 October 2026Reviewer expressly names game controllers among USB-A peripherals. Specific controller models and Bluetooth gaming support are unproved.

Not available

Power

2 of 5 differ

Power supply

USB7Reviewandroidauthority.com/onn-4k-pro-2026-review-3677202Read 8 October 2026

External DC adapter1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Supplied external power adapter, dedicated Power connector and 12 V input shown in product details. Not USB-powered.

Rated power inputiDevice input rating, as published. An external adapter output rating is separate.

Not available

12 V, 1.5 A1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Power input table literally 12 V - 1.5 A. Device input only. Does not prove included adapter output or power consumption.

Included adapter outputiRated output of the included power adapter. This is not device power consumption.

Not available

Not available

Max power consumption (claimed)iMaker-published maximum device power consumption. Adapter rating is not proof.

Not available

Not available

Standby power (claimed)iMaker-published device standby consumption under the source conditions.

Not available

Not available

Measured

None of 4 known

Video playback power (measured)iReviewer-measured device consumption. Video format, app, resolution, power measurement point and equipment belong in source notes.

Not available

Not available

Idle power (measured)iReviewer-measured device consumption when idle. Firmware, measurement point and conditions belong in source notes.

Not available

Not available

Standby power (measured)iReviewer-measured device consumption in standby. Network state, firmware and measurement point belong in source notes.

Not available

Not available

Boot time (measured)iReviewer-measured time from power-on to usable home screen. Cold boot and standby wake are different. Record timing method and firmware.

Not available

Not available

Dimensions and weight

2 of 4 differ

DimensionsiDevice body without remote, cables or adapter. Width is left-to-right in normal use, height is bottom-to-top and depth is front-to-back. For a stick, include the fixed plug only when the source does. A stick's length from the plug to its end is depth and its thickness is height. A puck that lies flat has its thickness as height.

Not available

Width124.4Height25.4Depth127mm(4.9 × 1 × 5 in)1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Maker size table publishes 124.4 x 127.0 x 25.4 mm without axis labels. Exact 4850R Dell retail table separately identifies width 4.9 inches, depth 5 inches and height 1 inch. Those labels establish the axis order. Stored metric values remain literal maker numbers, without converting rounded inches.15Retailer pagedell.com/en-us/shop/homeentertainment/apd/roku-ultra-4850r-network-audio-video-player-wireless-lan-usb-hdmi-cable-included/7t26pn/4850rRead 7 October 2026Exact 4850R Physical Characteristics names width 4.9 inches, depth 5 inches and height 1 inch. Used only to establish the axis order of maker literal metric dimensions.

WeightiDevice only, without remote, cable or power adapter. Included fixed cable or plug conditions belong in source notes.

Not available

167.2g(5.9 oz)1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Weight table explicitly 167.2 g (5.9 ounces). Player-only product details, no remote or adapter.

Remote dimensionsiSupplied remote body. Height is its length along the buttons, width is across the buttons and depth is front-to-back.

Not available

Not available

Remote weightiSupplied remote weight. State whether replaceable batteries are included.

Not available

Not available

Certifications

None of 1 known

FCC ID

Not available

Not available

Other certifications

Not available

Not available

In the box

1 of 2 differ

In the box

4K Pro Streaming Device, Voice remote, 2 AAA batteries, HDMI cable (1.5 m), AC adapter, Quick Start Guide2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 20263Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026Maker box lists device, remote with two AAA batteries, 1.5 m HDMI cable, AC adapter and QSG. Adapter cable length has conflicting metric/imperial text and is omitted.

Roku Ultra streaming player, Roku Voice Remote Pro (2nd edition), USB-C charging cable for remote, Premium High Speed HDMI cable, Power adapter1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Exact Model 4850R box inventory lists player, second-edition remote, remote USB-C cable, Premium High Speed HDMI cable and power adapter. No remote headphone jack, batteries or old-model extras imported.

HDMI cable includediA separate HDMI cable supplied in the box. A fixed HDMI plug or captive lead does not count. A short HDMI extender supplied with a stick counts, and the source note says it is an extender.

Yes2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 20263Maker product pageandroidauthority.com/wp-content/uploads/2026/04/Onn-4K-Streaming-Box-2026_2-scaled.jpegRead 8 October 2026

Yes1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Exact product box explicitly supplies a separate Premium High Speed HDMI cable.

Links

Not compared

Product page

www.walmart.com/ip/183822139621Maker product pagewalmart.com/ip/18382213962Read 8 October 2026

www.roku.com/products/roku-ultra1Maker product pageroku.com/products/roku-ultraRead 7 October 2026Exact current 4850R product details, read as ordinary public HTML.

Spec sheet

Not available

Not available

Manual

www.androidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdf2Owner's manualandroidtv-guide.com/wp-content/uploads/2026/08/Onn-4K-Pro-2026-Manual.pdfRead 8 October 2026

image.roku.com/c3VwcG9ydC1B/Roku-Ultra-2024-QSG.pdf14Owner's manualimage.roku.com/c3VwcG9ydC1B/Roku-Ultra-2024-QSG.pdfRead 7 October 2026Exact Roku support model 4850 link points to Roku-Ultra-2024-QSG.pdf. Independently downloaded one-page 2024 guide. No older UltraLT guide used.

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

Not available

Not available

Warranty

1 of 1 differ

Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

Not available

1year11Maker spec sheet (PDF)images.thdstatic.com/catalog/pdfImages/5b/5b125123-9613-4138-9e94-2095d9c4cb30.pdfRead 7 October 2026Roku-branded US streaming player warranty. Page 1: one year from original end-user purchase and delivery in US from Roku/authorized seller. Retailer-hosted maker document. Consumer statutory rights excluded.

Both are also in the API. Back to all streaming devices.