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Bose SoundLink Flex Portable Speaker (2nd Gen)

BosePortable wireless speaker

SoundLink Flex Portable Speaker (2nd Gen)

Released September 2024.5Reviewsoundguys.com/bose-soundlink-flex-2nd-gen-review-125253Read 8 October 2026Exact second-generation review product release date: September 2024. This is not the 2021 first-generation review. Last checked 23 October 2026.

Rated audio power
Not available
Playback time (claimed)
12h
Dust and water rating
IP67
Weight
590g

47 of 96 fields known.

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All specs

SourceCalculated

General

Series
SoundLink1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Model numbers
4425913Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Regulatory information, page 4: Model 442591.
GTIN / EAN
Not available
Announced
Not available
Status
Available1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Predecessor
Bose SoundLink Flex Bluetooth Speaker5Reviewsoundguys.com/bose-soundlink-flex-2nd-gen-review-125253Read 8 October 2026SoundGuys calls the original Bose SoundLink Flex the predecessor of the SoundLink Flex (2nd Gen).
Successor
Not available
Launch price (US)
Not available
Launch price (EU)
Not available
Markets
US1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Colours
Black, Blue Dusk, Sandstone, Alpine Sage, Twilight Blue, Petal Pink, Citrus Yellow, Fog Grey, Dewdrop Mint1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Current maker page explicitly offers Dewdrop Mint. Other listed colors come from the exact-model support specification.2Maker product pagesupport.bose.com/s/article/product-specifications-bose-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026
Speaker type
Portable1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Audio

Audio channels
Mono1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Audio drivers
Driver typeCount
Full-range1
Source4Maker product pagesupport.bose.com/article/poor-sound-quality-from-product-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026Exact second-generation support article: one active speaker and two passive radiators. Full-range role is also stated in product-page sound options.
Passive radiators
24Maker product pagesupport.bose.com/article/poor-sound-quality-from-product-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026
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
Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Equalizer bands
35Reviewsoundguys.com/bose-soundlink-flex-2nd-gen-review-125253Read 8 October 2026Bose app offers Bass, Middle and Treble sliders.
Automatic sound adjustment
Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026PositionIQ senses speaker orientation and adjusts playback. Standing, lying and hanging orientations are supported.
Sound modes
Not available
Wireless stereo pairing
Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Two identical SoundLink Flex (2nd Gen) speakers provide left and right channels. Party Mode can link different compatible current SoundLink models.
Speaker link protocols
Bose Party Mode, Bose Stereo Mode, Bose SimpleSync1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Max linked speakers
21Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Two speakers in Party or Stereo Mode. SimpleSync connects to a compatible Bose smart speaker or soundbar.
Max Bluetooth group speakers
Not available

Connectivity

Bluetooth audio playback
Yes3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026
Bluetooth version
5.32Maker product pagesupport.bose.com/s/article/product-specifications-bose-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026
Bluetooth codecs
SBC, AAC, aptX Adaptive3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Page 18 explicitly identifies aptX Adaptive with a compatible Snapdragon Sound source. SBC and AAC are corroborated by the exact-model SoundGuys review.
Bluetooth profiles
A2DP, AVRCP, BLE, HFP2Maker product pagesupport.bose.com/s/article/product-specifications-bose-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026
Bluetooth LE Audio
Not available
Auracast
Not available
Multipoint
Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Multipoint source devices
21Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Bluetooth range (claimed)
Not available
Wi-Fi
No6Reviewrtings.com/speaker/reviews/bose/soundlink-flex-2nd-genRead 8 October 2026Public Wi-Fi test row explicitly says No. Member-only metrics were not used.
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
Not available

Controls and software

Speakerphone
Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Standard non-SE SoundLink Flex (2nd Gen). Maker specifications exclude the later SE variant from microphone support. No SE variant is included.
Voice assistants
Siri, Google Assistant6Reviewrtings.com/speaker/reviews/bose/soundlink-flex-2nd-genRead 8 October 2026Public Voice Assistant verdict explicitly supports the paired phone Siri or Google Assistant. No independent assistant on the speaker.
Controls
Power, Bluetooth pairing, Volume up/down, Play/pause, Next/previous track, Programmable shortcut3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Speaker Controls pages 19-23. Shortcut choices include linking, Spotify Tap or connected-phone voice assistant.
Companion app
Bose app1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
App platforms
iOS, Android1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
User firmware updates
Yes3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Care and Maintenance, Update the Speaker: Bose app OTA or Bose updater website.
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
Yes3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026
Playback time (claimed)
12h3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Page 25: up to 12 hours using Bluetooth A2DP at 50% volume, default EQ, Top 50 Global February 2024 tracks, 20-25 C. At maximum volume Bose specifies up to three hours.
Playback with battery extension (claimed)
Not available
Battery energy
Not available
Battery capacity
Not available
Nominal battery voltage
Not available
Battery chemistry
Lithium-ion2Maker product pagesupport.bose.com/s/article/product-specifications-bose-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026
User-replaceable battery
Not available
Full charge time
4h3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Page 25: up to four hours from 0 to 100% in standby, 5 V/1.5 A (7.5 W) USB-A supply.
Quick charge duration
Not available
Playback after quick charge
Not available
Charging input rating
5 V DC, 1.5 A3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Regulatory information, page 4: Input Rating 5 V DC, 1.5 A. This is device input, separate from adapter output.
Max charging input
Not available
USB Power Delivery charging
Not available
Charges other devices
No1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Maker comparison table: Charging Out No.
Max power-bank output
Not available
Wireless charging
Not available

Durability

Dust and water rating
IP671Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Floats
Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Drop resistance
Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026
Drop test height
Not available
Carry features
Nylon utility loop1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Measured

Playback time (measured)
7.05h5Reviewsoundguys.com/bose-soundlink-flex-2nd-gen-review-125253Read 8 October 2026Exact SoundLink Flex (2nd Gen) review: 7 h 3 min. Looping music at 80 dB from one meter. Firmware 4.3.30, Bose app 10.3.13. Volume is higher than the maker 50% runtime test.
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

Dimensions
Not available
Weight
590g(1.3 lb)7Maker product pagebose.de/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Technical specifications: complete product system 0.59 kg. Convert published metric value to grams. H/D axes are conflicting between US product sections and are omitted.
Body materials
Aluminum, Fabric, Nylon, Plastic, Silicone, Steel1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

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
SoundLink Flex Portable Speaker (2nd Gen), USB-C to USB-A cable, Safety sheet1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Warranty

Manufacturer warranty (source market)
1year1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026US maker page: included one-year Bose limited warranty. BoseCare paid extensions are excluded.

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Sources

We read 7 sources for this wireless speaker. The numbers match the markers in the sheet.

  1. Read 8 October 2026Backs 25 fields
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