We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-08 · 8 min read · Independent comparison
For library use, my top pick is the Avantree Medley Air — a TV-first open-ear set with a charging dock that doubles as a Bluetooth transmitter, which is the one design here that solves a specific problem instead of just checking boxes.
• Avantree Medley Air — best for watching lectures or TV audio without sealing your ears; pick this if your source device has an optical or 3.5mm output and you want a dock-based setup with no app.
• Anker Soundcore AeroFit 2 — best for switching between awareness and focus in one pair; pick this if you want semi-in-ear ANC plus open-ear mode and Hi-Res LDAC audio.
• Anker Soundcore AeroFit 2 — best for longer desk sessions and calls; pick this if you want the same dual-mode design with a lighter listed weight and a longer claimed battery figure.
• Monster Open Ear AC312 — best for sporty, budget-minded listening; pick this if you want big 16mm drivers, Bluetooth 5.4 and touch controls.
The Medley Air is not really a "go anywhere" pair. It's a TV-listening tool that happens to be shaped like open-ear earbuds. The package includes a dock that is also a Bluetooth transmitter, so you connect the dock to your TV once and the earbuds pair to it. That removes the fiddliest part of open-ear audio for a lot of people: juggling Bluetooth pairing every time you sit down.
The open-ear fit is the whole point. Nothing goes inside your ear canal, so you keep awareness of the room around you. If you're studying in a library and want a documentary or lecture playing low while you still hear a friend approach your table, that's the exact scenario this design serves. Avantree also tunes these for speech clarity, which matters more than bass for news, talks and dialogue-heavy content.
There are real limits, and you should know them before buying. It works with TVs that have optical (TOSLINK) or AUX 3.5mm output — check your ports first. Only optical passthrough is supported, so if you're routing through a soundbar over HDMI ARC, that path won't work. Avantree also notes the ear and neck bands can't be adjusted or replaced, and the headband may be too small for larger head sizes. The rear protrusion can dig in if you recline. Battery is listed at up to 8 hours at normal volume, and high volume shortens that. If you connect optically, set the TV output to PCM/Stereo.
So who is this for? In my opinion, it's for someone who wants one dedicated audio source — a TV, a monitor, a lecture feed — piped privately into open ears, with other people in the room still hearing the main speakers. As a general-purpose wireless headset for library work on a laptop or phone, it's a narrower tool than the others here.
This is the most interesting design in the group because it doesn't force you to choose a philosophy. Open-ear when you want to hear what's happening around you, semi-in-ear active noise cancellation when you want to shut the room out. That switch is the feature. In a library, that's genuinely useful: open mode for a quiet study floor where you still want to catch a name being called, ANC mode for a noisy cafe corner or a commute.
The hardware backs it up. 11.8mm dynamic drivers, Hi-Res Audio and LDAC support, plus 360° spatial audio with head tracking. Bluetooth 6.1, IP55 water resistance, and four mics with AI-assisted call clarity. The hooks are adjustable, and the charging case is built so you can drop the earbuds in at any of the five hook positions without resetting the angle first — a small thing that saves annoyance daily.
Battery is where you need to read the fine print, because the modes differ. Anker lists up to 7 hours per charge in open-ear mode and 34 hours total with the case, or 5 hours in ANC mode and 24 with the case, all at 50% volume. Turn LDAC on and those numbers drop to 6 hours open-ear or 3 hours ANC. A 10-minute charge adds up to 3.5 hours. The trade-off is straightforward: ANC and high-resolution codecs both cost you runtime, so the biggest numbers only apply in the least demanding mode. Fit is also conditional — Anker says it suits ear diameters over 16mm.
For a library-focused shopper, I'd frame this as the flexible pick. One pair covers the quiet floor, the group-study room and the walk home.
Anker Soundcore AeroFit 2
This second AeroFit 2 listing shares the same core platform as the one above — same 11.8mm drivers, same dual open-ear and ANC modes, same LDAC and Hi-Res support, same 4-mic call setup, same IP55 rating, same adjustable hooks and drop-in case, same Bluetooth 6.1. The differences in the published sheets are mostly in the finish and the battery figure, so treat this as a variant rather than a different animal.
What stands out in this listing is the battery number: 43 hours is the listed average life, versus 7 hours on the other sheet. That gap is almost certainly a difference in how the figure is expressed — per-charge versus with-case totals — rather than a genuinely different cell. Anker's own mode-by-mode breakdown (7 hours open-ear, 5 in ANC, dropping further with LDAC) is the number I'd plan around for a single sitting. The other visible differences: this version is listed in white with a slightly different model name, and its listed unit weight is much lower, which reads like a data-entry quirk rather than a real design change.
Functionally, this is the same recommendation. If you want a wireless headset for library sessions that can flip between staying aware and shutting out chatter, this is the design to consider. It's also the one I'd lean toward for gaming headphones duty in a shared space — button controls, low-latency wireless, and the option to mute the room while keeping the earbuds out of your ear canals.
Monster Open Ear AC312
The AC312 takes the opposite approach from the Avantree: instead of one dedicated source, it's a general Bluetooth set built around big drivers. 16mm dynamic drivers are the headline, and Monster pairs them with a bass-forward tuning and 105dB sensitivity. That's a lot of driver area for an open-ear design, and the practical result is more low-end presence than most open-ear sets manage, at the cost of some subtlety in the midrange.
On the feature side you get Bluetooth 5.4 for a faster, more stable connection, ENC noise cancellation on the mic for calls, touch controls, IPX5 water resistance, and 32 hours of listed playtime. The open-ear shape is described as resting on top of the ear rather than in it, with silicone used for comfort. It's pitched at sports — running, cycling, hiking, workouts — and the IPX5 rating and secure-fit language fit that pitch.
For library use specifically, this is the least specialized option here. There's no ANC mode for the earbuds themselves, no LDAC, no dock, no transmitter. What you get is straightforward wireless audio with awareness built in and a big, energetic sound. If your library time is really "podcast while I walk there, then music while I read," that's a reasonable fit. If you're trying to concentrate in a genuinely loud space, the lack of earbud-side noise cancellation is the gap.
The main trade-off, in my opinion, is focus: this set is tuned and marketed for movement and impact, not for quiet, critical listening. Touch controls are also a matter of taste — easy to trigger by accident when you adjust the fit.
We compared the published spec sheets side by side: driver size, noise-control type, Bluetooth version, battery figures, fit adjustability, water resistance and connectivity. The ordering reflects our own editorial judgment about which design best serves quiet-space listening, and no brand paid for placement or influenced the ranking. Where a spec could be read two ways — like the two AeroFit 2 battery figures — we said so instead of picking the flattering number.
FAQ
It depends on the design. The AeroFit 2 models use semi-in-ear active noise cancellation, which is designed to reduce everyday background noise. Truly open designs like the Medley Air and the AC312 have no earbud-side ANC at all — they rely on you still hearing the room.
Yes, with limits. The AeroFit 2 models list four mics with AI-assisted call clarity, and the AC312 uses ENC mic noise cancellation. The Medley Air lists no noise control on the earbuds, so it's better suited to listening than to calls.
The AC312 is built for sports with a secure on-ear fit and IPX5 water resistance. The AeroFit 2 models use adjustable hooks, which help you tune the fit. Fit is individual — Anker notes its design suits ear diameters over 16mm.
Yes. It requires an optical (TOSLINK) or AUX 3.5mm output on your TV, and only optical passthrough is supported — HDMI ARC passthrough is not. If you connect optically, set the TV audio output to PCM/Stereo.
If I had to point one shopper at a single answer: for library sessions where you want to choose between staying aware and shutting out the room, I recommend the Anker Soundcore AeroFit 2. For a fixed listening station where you want private TV or lecture audio without sealing your ears, the Avantree Medley Air is the better-shaped tool.
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