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Bose SoundLink Flex Bluetooth Speaker

BosePortable wireless speaker

SoundLink Flex Bluetooth Speaker

Released October 2021.3Reviewsoundguys.com/bose-soundlink-flex-review-63268Read 13 October 2026Review lists product release date October 13, 2021. T3 says October 2021 in the US and December 2021 in the UK. iFixit says October 21, 2021. Last checked 21 October 2026.

Rated audio power
Not available
Playback time (claimed)
12h
Dust and water rating
IP67, IP64
Weight
589g

40 of 96 fields known.

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At a glance

Ports

  • USB-C

All specs

SourceCalculated

General

Series
SoundLink2Maker product pagebose.ca/en/p/bose-soundlink-flex-bluetooth-speaker/SLFLX-SPEAKERWIRELESS-WHTSM-WW.htmlRead 13 October 2026Bose lists the speaker in its SoundLink family of portable Bluetooth speakers. iFixit lists the same family.
Model numbers
865983-0100, 4359101Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Regulatory section of the owner's guide lists Type designation 435910 for the Bluetooth speaker. SoundGuys lists 865983-0100 for the US Black item.3Reviewsoundguys.com/bose-soundlink-flex-review-63268Read 13 October 2026Review lists Model Number 865983-0100, the US Black item.
GTIN / EAN
Not available
Announced
Not available
Status
Not available
Predecessor
Not available
Successor
Bose SoundLink Flex Portable Speaker (2nd Gen)8Reviewsoundguys.com/bose-soundlink-flex-2nd-gen-review-125253Read 13 October 2026Review calls the SoundLink Flex (2nd Gen) the follow-up to the original SoundLink Flex that came out in 2021. The 2nd Gen has Bluetooth 5.3 and the Bose app.
Launch price (US)
$1493Reviewsoundguys.com/bose-soundlink-flex-review-63268Read 13 October 2026Review lists an original price of 149 USD. T3 and What Hi-Fi also give 149 USD. Tax treatment is not stated.
Launch price (EU)
Not available
Markets
US3Reviewsoundguys.com/bose-soundlink-flex-review-63268Read 13 October 2026US price in USD and the US Black model number 865983-0100.
Colours
Not available
Speaker type
Portable7Spec databaseifixit.com/Device/SoundLink_FlexRead 13 October 2026iFixit describes a portable Bluetooth speaker.

Audio

Audio channels
Not available
Audio drivers
Driver typeCount
Full-range dynamic driver1
Source6Reviewt3.com/us/reviews/bose-soundlink-flex-reviewRead 13 October 2026Review says the driver array is a single full-range dynamic driver. Bose does not publish its size or power.
Passive radiators
26Reviewt3.com/us/reviews/bose-soundlink-flex-reviewRead 13 October 2026Review says the single driver is supplemented by a couple of racetrack passive radiators, so two.
Rated audio power
Not available
Rated audio power on mains
Not available
Audio output power (unspecified rating)
Not available
Peak audio power
Not available
Frequency response lower limit (claimed)
Not available
Frequency response upper limit (claimed)
Not available
Signal-to-noise ratio (claimed)
Not available
Adjustable equalizer
No5Reviewtomsguide.com/audio/bluetooth-speakers/bose-soundlink-flex-reviewRead 13 October 2026Review lists no customizable EQ as a con. T3 also says there is no EQ in the app.
Equalizer bands
Not available
Automatic sound adjustment
Yes4Reviewwhathifi.com/reviews/bose-soundlink-flexRead 13 October 2026Review says PositionIQ technology uses built-in sensors to detect the speaker's orientation and adjusts the sound to it.
Sound modes
Not available
Wireless stereo pairing
Yes1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Owner's guide (PDF created March 2024) describes Stereo mode with a second compatible speaker: SoundLink Micro, Flex, Color II, Revolve and Revolve+ (Series I and II). It does not work with the 2nd Gen Flex, which uses a different app.
Speaker link protocols
Bose Party Mode, Bose Stereo Mode, Bose SimpleSync1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Party mode and Stereo mode for two Bose Bluetooth speakers, and SimpleSync to link with a Bose Smart Speaker or Soundbar through the Bose app.
Max linked speakers
21Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide says pair two Bose Bluetooth speakers for Party mode or Stereo mode. SimpleSync pairs with only one Bose product at a time.
Max Bluetooth group speakers
Not available

Connectivity

Bluetooth audio playback
Yes3Reviewsoundguys.com/bose-soundlink-flex-review-63268Read 13 October 2026
Bluetooth version
4.23Reviewsoundguys.com/bose-soundlink-flex-review-63268Read 13 October 2026Review says Bluetooth 4.2 with the SBC codec only. Bose 2nd Gen coverage also says the original uses Bluetooth 4.2.
Bluetooth codecs
SBC3Reviewsoundguys.com/bose-soundlink-flex-review-63268Read 13 October 2026Review says only the standard SBC codec is supported. This is a reviewer statement and not a maker document.
Bluetooth profiles
Not available
Bluetooth LE Audio
Not available
Auracast
Not available
Multipoint
Yes1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide says the speaker can be actively connected to two devices at a time and plays audio from one device at a time.
Multipoint source devices
21Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Up to two actively connected devices. Up to eight devices are stored in the pairing list.
Bluetooth range (claimed)
9m1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide gives a Bluetooth range of 30 ft or 9 m.
Wi-Fi
Not available
Wi-Fi standards
Not available
Network audio protocols
Not available
USB audio input
Not available
USB drive playback
Not available
USB audio file formats
Not available
Ports
ConnectorCountRole
USB-C1Charging input
Source1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide says charge with the USB-C cable and shows no other connector. SoundGuys confirms there is no aux input.

Controls and software

Speakerphone
Yes1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide documents answering, ending, declining and muting calls with the built-in microphone.
Voice assistants
Connected phone voice assistant1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide says the speaker microphone extends the phone's microphone and press and hold of the multi-function button opens the voice assistant on the connected device.
Controls
Power, Bluetooth pairing, Play/pause, Next/previous track, Volume up/down, Answer/end call, Voice assistant1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide lists Power, Bluetooth, Volume up and down and a multi-function button: press for play/pause and answer/end call, twice for skip forward, three times for skip backward, hold for voice control.
Companion app
Bose Connect1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide names the Bose Connect app for setup, Bluetooth connections and settings. The Bose app is needed for SimpleSync.
App platforms
iOS, Android2Maker product pagebose.ca/en/p/bose-soundlink-flex-bluetooth-speaker/SLFLX-SPEAKERWIRELESS-WHTSM-WW.htmlRead 13 October 2026Page says apps are available on Google Play and the Apple Store.
User firmware updates
Yes1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide says the speaker receives security updates through the Bose Connect app and software updates can be run in the app.
Built-in lighting
Not available
Lighting modes
Not available

Smart home

We could not find any of these 3 fields. Show them
Matter controller
Not available
Thread border router
Not available
Zigbee hub
Not available

Battery and charging

Built-in battery
Yes1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide describes a rechargeable lithium-ion battery that is not to be removed by the user.
Playback time (claimed)
12h1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide says with typical usage the battery lasts up to 12 hours and varies with content and volume.
Playback with battery extension (claimed)
Not available
Battery energy
Not available
Battery capacity
Not available
Nominal battery voltage
Not available
Battery chemistry
Lithium-ion1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide regulatory text names a rechargeable lithium-ion battery.
User-replaceable battery
Not available
Full charge time
4h1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide says allow up to 4 hours to fully charge the battery. No adapter is included.
Quick charge duration
Not available
Playback after quick charge
Not available
Charging input rating
5 V DC at 1.5 A1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Regulatory section lists Input Rating 5Vdc, 1.5A.
Max charging input
Not available
USB Power Delivery charging
Not available
Charges other devices
Not available
Max power-bank output
Not available
Wireless charging
Not available

Durability

Dust and water rating
IP67, IP641Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide says the speaker is rated IP67 and IP64 and can be immersed for up to 30 minutes at a depth of up to 1 m.
Floats
Not available
Drop resistance
Not available
Drop test height
Not available
Carry features
Built-in strap1Owner's manualassets.bosecreative.com/m/43ab91c25d0ac95a/original/866666_OG_SLFLX-SPEAKERWIRELESS_enUS.pdfRead 13 October 2026Guide says the strap works as a finger loop or attaches to a carabiner or a cord.

Measured

Playback time (measured)
11.98h3Reviewsoundguys.com/bose-soundlink-flex-review-63268Read 13 October 2026Review reports 11 hours 59 minutes, which is 11.98 h, in the standard test: continuous music at a 75 dB (SPL) maximum output level measured 1 m from the front of the speaker. Firmware and codec are not stated.
Max sound pressure (measured)
Not available
Low-frequency extension (measured)
Not available
High-frequency extension (measured)
Not available
Audio latency (measured)
Not available
Full charge time (measured)
Not available

Dimensions and weight

Front and side, drawn to scale.

Dimensions
Width201Height90Depth52mm(7.9 × 3.5 × 2 in)4Reviewwhathifi.com/reviews/bose-soundlink-flexRead 13 October 2026Review spec box lists Dimensions (hwd) 9 x 20.1 x 5.2cm, so height 90 mm, width 201 mm, depth 52 mm. Bose's own inch figures 3.56 H x 7.93 W x 2.06 D as reproduced by iFixit agree.
Weight
589g(1.3 lb)3Reviewsoundguys.com/bose-soundlink-flex-review-63268Read 13 October 2026Review spec box lists 589g. Bose's own spec as reproduced by iFixit is 1.300 lb.
Body materials
Aluminum, Fabric, Nylon, Plastic, Silicone, Steel7Spec databaseifixit.com/Device/SoundLink_FlexRead 13 October 2026Product Material Aluminum, Fabric, Nylon, Plastic, Silicone, Steel, as in Bose's own specification.

Certifications

We could not find any of these 2 fields. Show them
FCC IDs
Not available
Other certifications
Not available

In the box

In the box
Speaker, USB Type-C cable2Maker product pagebose.ca/en/p/bose-soundlink-flex-bluetooth-speaker/SLFLX-SPEAKERWIRELESS-WHTSM-WW.htmlRead 13 October 2026What's in the box: Bose SoundLink Flex Bluetooth speaker and USB Type-C cable. SoundGuys says the cable is USB-C to USB-A.

Warranty

We could not find any of these 1 fields. Show them
Manufacturer warranty (source market)
Not available

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Sources

We read 8 sources for this wireless speaker. The numbers match the markers in the sheet.

  1. Read 13 October 2026Backs 21 fields
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