Bose Ultra Open Earbuds vs Anker soundcore AeroFit 2

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Ultra Open Earbuds compared with AeroFit 2

	BoseUltra Open Earbuds	Anker soundcoreAeroFit 2
Overview
Released
Released	February 2024	October 2024
Sound
Type
Type	Open-ear	Open-ear
Noise cancelling
Noise cancelling	No	No
Spatial audio with head tracking
Spatial audio with head tracking	Yes	–
Bluetooth codecs
Bluetooth codecs	SBC, AAC and aptX Adaptive	SBC, AAC and LDAC
Drivers
Drivers	Bose OpenAudio, a transducer in a tightly controlled acoustic structure that aims sound at the ear canal with little leakage	20 × 11.5 mm racetrack drivers with BassTurbo acoustic structure; rectangular dimensions retained rather than treating one axis as diameter.
Audio features
Audio features	Bose Immersive Audio (Still keeps the sound in place as you turn your head; Motion lets it follow) using an onboard IMU; Auto Volume adjusts the volume to the noise around you; three-band EQ in the Bose app; aptX Adaptive with Snapdragon Sound devices	App EQ, presets and spatial audio. LDAC requires a compatible source; it does not provide the same codec on iOS.
Battery
Listening time (maker's claim)
Listening time (maker's claim)	Up to 7 hours	Up to 10 hours
With the case
With the case	Up to 26.5 hours	Up to 42 hours
Wireless charging
Wireless charging	No	Yes
Battery life detail
Battery life detail	Bose UK's page gives up to 7 hours per charge (4 hours with Immersive Audio or Auto Volume on) and up to 19.5 more hours from the case (12 hours with Immersive Audio on); the launch press release and owner's guide give 7.5 hours per charge and 27 hours in total (3.5 hours per charge with both Immersive Audio and Auto Volume on); up to 48 hours connected but not playing	Maker FAQ: about 10 hours music at 50% volume and 42 hours including case; about 8 hours calls at 50% volume. UK introduction says 35 hours with case, but its spec table, exact FAQ and maker launch release agree on 42; 42 retained. Settings, codec and volume affect use.
Charging case
Charging case	USB-C; earbuds charge in up to 1 hour, the case in up to 3 hours; a wireless charging case cover is sold separately	USB-C and wireless charging; 750 mAh case, about two hours for a full charge. Each earbud 70 mAh, about one hour to charge (maker FAQ).
Fast charging
Fast charging	10 minutes in the case gives up to 2 hours of playback	Ten minutes charging earbuds provides up to four hours playback; fast charging is not claimed for the case.
Design
Weight (each earbud)
Weight (each earbud)	6.4 g (better)	10 g
Water and sweat resistance
Water and sweat resistance	IPX4	IP55
Bluetooth
Bluetooth	5.3	5.4
Two devices at once
Two devices at once	Yes	Yes
Controls
Controls	A physical button on top of each earbud's battery barrel for play, pause, skip, volume and calls; press-and-hold shortcut customisable in the Bose app (for example Switch Source)	Customisable touch controls; volume control disabled by default, can be enabled in the app. No wearing detection. Case pairing/reset button.
Microphones
Microphones	–	Four microphones with AI call-noise reduction
Fit and ear tips
Fit and ear tips	Cuff-shaped design that clips onto the side of the ear, with a silicone-coated flex arm joining the speaker to a battery barrel behind the ear; plastic (PC-ABS), metal and silicone	Non-sealing open-ear fit with four-level adjustable ear hooks UK maker table states 10 g, identified per earbud by the exact HIFI.DE review; SoundGuys gives 8 g, so maker figure retained.
Case weight
Case weight	0.097 lb (about 44 g)	–
Water resistance detail
Water resistance detail	IPX4 for the earbuds	IP55 applies to earbuds; maker FAQ states charging case is not waterproof. Not for swimming or diving.
Works with
Works with	Bose app (launched with Bose Music) for iOS and Android; multipoint connection to two devices since a July 2024 update; Google Fast Pair; Personal Surround Sound as rear speakers with the Bose Smart Soundbar (2024)	soundcore app; two-device connection and single-earbud use. Current AI Translation requires app 3.8.7 or later and latest earbud firmware; this is a later feature, absent from the 2024 review software. UK store also offers a separate AI Assistant style; this entry describes the basic A3874 model.
Colours
Colours	Black and White Smoke at launch; Bose UK has since sold several limited editions, currently Desert Gold	Launch Black, White, Minty Green and Abyss Blue; blue shipping planned later in 2024. Current UK labels Midnight, Champagne Mist, Jungle Green and Light Blue.
In the box
In the box	Two earbuds, charging case, USB-C (A to C) cable (30 cm), safety sheet	–