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Device A

Buds 4 Pro

Xiaomi · Sound

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Device B

Bose · Sound

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Every available group and stored value, aligned by field.

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LAUNCH DATE3 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Announced	Announcement date not recorded	Announcement date not recorded
Released	Release date not recorded	2026-10-01
Status	Release status not recorded	Available

ADDITIONAL INFORMATION3 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Launch Price (USD)	$268.00 (reference only — see Price in Nigeria above for the actual retail price)	$299 (US launch price)
Notes	—	Personal Surround support with Bose Smart Soundbars removed versus 1st Gen
Price in Nigeria	₦375,000 (Stored estimate)	₦418,600 (Stored estimate)

PRODUCT OVERVIEW5 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Brand	Xiaomi	Bose
Category	True Wireless Earbuds	Open-ear cuff true wireless earbuds
Launch Date	August 11, 2022	September 17, 2026
Model Name	Xiaomi Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Price	€249.99 global (~$268 USD); China price CNY 999 (~$145)	$299 (US launch)

AUDIO SPECIFICATIONS4 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Driver Size	11 mm	—
Driver Type	Dynamic driver	Improved dynamic driver (deeper bass, higher volume), Bose OpenAudio technology
Impedance	16 ohm	—
Sound Features	Dimensional/Spatial Audio with head tracking, Intelligent Fit Monitoring	Spatial audio: Immersive Audio; Cinema Mode with Bose TrueSpatial head tracking

FEATURES AND SOFTWARE8 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Active Noise Cancellation (ANC)	Yes, up to 48dB adaptive ANC	No (open-ear)
App Support	Xiaomi Earbuds app	Bose app
Customizable EQ	—	Yes, 3-band EQ in Bose app
Other Features	—	Auto Volume, 3-band EQ (Bose app); Google Fast Pair
Sound Modes	ANC / Transparency / Off, Dimensional Audio	Immersion Mode, Cinema Mode, Stereo
Touch Controls	Force sensor stem — pinch gestures	No, physical button on each earbud (play/pause, track, volume, calls)
Transparency / Ambient Mode	Yes, 3 modes	—
Voice Assistant Support	Google Assistant / Siri (via phone)	Phone's native voice assistant (Alexa+ planned)

CONNECTIVITY AND INTEGRATION6 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Bluetooth Profiles	BLE, HFP, A2DP, AVRCP	—
Bluetooth Version	5.3	5.4, range up to 30 ft (9 m)
Multipoint	Yes, dual-device	Yes, two devices
Range	10m (open space)	9 m (30 ft)
Supported Codecs	SBC, AAC; proprietary up to 990kbps/32-bit	SBC, AAC, aptX Adaptive (Snapdragon Sound)
Wired Mode	Not supported	—

BUILD AND DESIGN6 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Colors Available	Star Gold, Space Black	Black, White Smoke, Cherry Chocolate, Olive Green, Sky Pink (last three limited edition)
Dimensions	Earbud 30.74 x 21.23 x 23.67mm; Case 46.58 x 59.28 x 26.79mm	Earbud: 18.9 x 17.7 x 27.7 mm; Case: 47.5 x 26.8 x 66.0 mm
Form Factor	In-ear with silicone tips	Open-ear cuff true wireless earbuds
Ingress Protection	IP54	IPX4
Materials	Plastic housing, silicone ear tips	Polycarbonate and silicone; metallic cap with beveled finish; flex-joint cuff
Weight	Earbud 5.0g; Case 39.5g	5.9 g (single earbud), 49.9 g (case)

BATTERY CAPACITY AND CHARGING6 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Battery Life (Standby)	—	Up to 20 hours (connected, no audio)
Charging Port	USB-C	USB-C, wireless charging case; full charge 1 hour
Device Battery Capacity	Earbud 53mAh; Case 565mAh	—
Fast Charging	Case input 5V/2.3A	10 min = up to 2 hours
Total Playtime	9 hrs (ANC off); up to 38 hrs with case	Earbuds: Up to 9 hours (up to 5 hours with Immersive Audio); With case: Up to 19.5 additional hours (28.5 hours total)
Wireless Charging	Yes	Yes, Qi

MICROPHONES AND VOICE FEATURES3 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Hands-Free Calls Support	Yes	Yes, Bose SpeechClarity
Mic Count	3 mics + VPU per earbud	2
Mic Type / Noise Reduction	3-mic + VPU with AI call noise cancellation	2 microphones, Bose SpeechClarity voice isolation

BOX CONTENTS7 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Charging Cable	USB-C cable	Not listed in box contents (power adapter not included)
Ear Tips (if earbuds)	Multiple silicone sizes	No (open-ear cuff design)
Extras (cases, clips, mounts, etc.)	Charging case	Charging case
Included Items	—	Earbuds, charging case, quick start guide, safety sheet (no power adapter)
Main Device	2x earbuds	2 Ultra Open Earbuds (2nd Gen)
User Manual	Yes	Quick start guide, safety sheet
Warranty Card	—	1-year Bose limited warranty

COMPATIBILITY3 fields

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Operating Systems	Android, iOS	Android, iOS (Bose app on Google Play and App Store); any Bluetooth device
Profiles Supported	HFP, A2DP, AVRCP, BLE	—
Supported Devices	Bluetooth 5.3+ smartphones/tablets	Any Bluetooth-enabled phone, tablet or computer; preorders from 19 Sep 2026

KEY HIGHLIGHT1 field

Specification	Buds 4 Pro	Ultra Open Earbuds (2nd Gen)
Highlight	Xiaomi's 2023 flagship ANC earbuds, notable for 48dB adaptive ANC and Dimensional spatial audio with head tracking.	The Bose Ultra Open Earbuds (2nd Gen) are cuff-style open-ear earbuds with an improved driver for deeper bass, Bose OpenAudio, Immersive Audio and Cinema Mode with TrueSpatial head tracking.