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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-26 · 7 min read · Independent comparison
• YEAHBOX Popo Air Open — biggest strength: an open-ring clip design that sits outside your ear canal, so there's no pressure or fatigue during long sessions, plus a sealed acoustic chamber that keeps your music from leaking into quiet rooms.
• YEAHBOX Popo Air Open — biggest trade-off: battery life is modest. You get up to 6 hours per charge and 18 hours total with the case, so heavy users will be reaching for the case regularly.
• Trusmi USB-C — biggest strength: a direct USB-C wired connection with zero pairing, zero latency, and a noise-reducing inline mic tuned for voices — ideal for calls, lectures, and video meetings.
• Trusmi USB-C — biggest trade-off: it's tethered. There's no battery, no case, and no wireless freedom — you're plugged into your device for the entire session.
• Who each pick is for: YEAHBOX is for people who wear earbuds for hours and hate the plugged-ear feeling; Trusmi is for people who mostly talk, watch, and study on a USB-C phone, tablet, or laptop.
The Popo Air Open is built around one idea: get sound into your ears without stuffing anything into them. The clip-on open-ear shape rests against the outside of your ear rather than sealing the canal, which is the whole reason it can stay comfortable through a long workday, a commute, or a training session. If traditional in-ear buds give you that dull ache after an hour, this is the design meant to solve exactly that problem.
Where it gets interesting is the sealed speaker chamber. Most open-ear designs broadcast your audio to everyone nearby, but YEAHBOX claims a sealed acoustic structure that keeps sound private. In my opinion, that combination — open-ear fit without the usual leakage — is the single most compelling thing about this model. It makes the Popo Air Open plausible for an office, a library, or a quiet train car, which is normally where open-ear buds fall apart.
Battery is the honest weak point. Six hours on a charge, eighteen total with the case. That's plenty for a workday or a gym session, but it's not a multi-day battery monster, and there's no wired fallback since there's no jack. The case itself is compact — roughly 5 by 2.5 by 6.5 cm and under 40 grams — so it disappears in a pocket.
Buy it if you want clip-on comfort for all-day wear, private listening in shared spaces, and wireless freedom for workouts and commutes. Skip it if you need multi-day battery, a wired connection, or you simply prefer the passive isolation of a sealed in-ear fit.
Trusmi USB-C: Who It's For
The Trusmi USB-C takes the opposite approach and does it well. It's a wired in-ear headphone that plugs straight into a USB-C port — no adapter, no dongle, no pairing screen. It works with USB-C iPhones, USB-C Android phones, USB-C tablets, and USB-C laptops. If your whole kit has moved to USB-C, this is the zero-friction option.
The tuning is deliberately voice-forward. A single 10mm dynamic driver covers a 20Hz–20kHz range with clear vocals, crisp mids, and balanced highs. That's not a bass-heavy tuning, and it isn't trying to be — it's aimed at podcasts, audiobooks, online lectures, YouTube, and video meetings, where intelligibility matters more than thump. If you spend your day listening to people talk, this profile is the right call.
Calls are the headline feature. The noise-reducing mic is rated to cut around 42dB of ambient noise, which is the difference between being heard in a coffee shop and repeating yourself three times. A three-button inline remote handles volume, playback, and call answering without touching your phone. Three silicone tip sizes (S, M, L) plus spare covers let you dial in a seal that stays put through long sessions.
The cable is a 4-foot, tangle-resistant design, which is short enough to be pocket-friendly but long enough to reach a laptop on a desk. Durability-wise, the reinforced cable is the part that usually fails first on cheap wired buds, so that's a meaningful detail. It's backed by a 2-year manufacturer warranty, which is longer than the 1-year coverage on the YEAHBOX.
Buy it if you want reliable, lag-free audio for calls, studying, and video on USB-C devices — and you don't mind being tethered. Skip it if you need wireless freedom for the gym, or if your devices still use Lightning or a headphone jack.
• Best for all-day comfort → YEAHBOX Popo Air Open. The open-ring clip avoids ear-canal pressure entirely; Trusmi's in-ear seal, even with three tip sizes, will fatigue some ears over long sessions.
• Best for calls and meetings → Trusmi USB-C. A dedicated noise-reducing mic and inline remote are purpose-built for voice; YEAHBOX relies on a dual-mic ENC setup, which is capable but wireless.
• Best for workouts and commutes → YEAHBOX Popo Air Open. IPX5 sweat resistance, Bluetooth 6.0, and a compact charging case make it the only one of the two that works untethered.
• Best for zero-latency audio and video → Trusmi USB-C. A wired digital connection has no pairing, no codec delay, and no dropouts.
• Best for private listening in quiet spaces → YEAHBOX Popo Air Open. The sealed acoustic design is meant to prevent leakage, so your music stays yours in an office or library.
• Best for battery independence → Trusmi USB-C. It draws power from your device, so there's no 6-hour ceiling and no case to charge.
• Best for voice-heavy content → Trusmi USB-C. The mid-and-high-focused tuning keeps speech crisp; YEAHBOX leans bass-forward for music and video.
• Best for mixed music and video listening → YEAHBOX Popo Air Open. Dual drivers with a HiFi tuning give it more range across genres.
• Best for device flexibility → YEAHBOX Popo Air Open. Bluetooth 6.0 connects to phones, laptops, and tablets alike, while Trusmi needs a USB-C port specifically.
In my opinion, the right pick comes down to how you actually use headphones, not which spec sheet looks longer. If you wear earbuds for hours, hate the plugged-ear feeling, want to move around untethered, and value private listening in shared spaces, I'd buy the YEAHBOX Popo Air Open — the clip-on design and sealed acoustics are a genuinely useful combination, and the 6/18-hour battery is a fair trade for it. If your day is calls, lectures, podcasts, and video on a USB-C phone or laptop, I'd buy the Trusmi USB-C instead: no pairing, no latency, a mic built for noisy rooms, and a 2-year warranty. For most people who talk more than they rock out, the Trusmi is the cleaner fit.
FAQ
Both handle calls, but differently. The Trusmi uses a wired noise-reducing mic rated to cut around 42dB of ambient noise and includes an inline remote, which suits noisy offices and coffee shops. The YEAHBOX uses a dual-mic ENC setup that reduces background noise over Bluetooth — solid, but the wired connection is inherently more stable for voice.
According to the product's design, no — the sealed speaker chamber is specifically built to keep audio private rather than broadcasting it like many open-ear designs. That's what makes it usable in an office or library, where leakage is usually the dealbreaker.
Yes, if your iPhone has a USB-C port — the manufacturer lists compatibility with USB-C iPhones, all USB-C Android phones, USB-C tablets, and USB-C laptops. It won't work with older Lightning iPhones or devices without a USB-C port, since there's no adapter included.
The Trusmi has effectively unlimited runtime because it's wired and draws power from your device. The YEAHBOX Popo Air Open gives you up to 6 hours per charge and up to 18 hours total with its charging case, which is fine for a workday but means regular case charging. As for current pricing, check the button on this page for the latest on Amazon.
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