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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-25 · 7 min read · Independent comparison
• IAMJOY's biggest strength: It's a translation device first — real-time two-way translation across 163 languages (78 languages and 85 accents), fast 0.5s response, and a no-subscription-fee translation app with nine different modes.
• IAMJOY's biggest trade-off: Battery is modest — 3 to 4.5 hours of continuous listening or translation per charge, with the charging case stretching it to a full day. And it's built for talking, not for critical listening.
• OPPO Enco Air5s' biggest strength: Endurance and audio hardware — up to 48 hours of playback with the case, adaptive noise cancellation, a 12mm dynamic driver with a titanium-coated diaphragm, and Bluetooth 6.0.
• OPPO Enco Air5s' biggest trade-off: Translation is a side feature here (AI Translate via the app), not the core purpose — nowhere near the language coverage or dedicated interpreter modes the IAMJOY offers.
• Pick IAMJOY if: you travel, study, or work across languages and want an interpreter living in your ears.
• Pick OPPO Enco Air5s if: you want everyday earbuds for music, calls, commuting and workouts with serious battery and noise control.
The IAMJOY CT28 is not really an earbud you buy for sound quality. You buy it because it translates. It supports two-way, real-time translation in 163 languages — broken down as 78 languages and 85 accents — with accuracy quoted at 90%+ and a response time of about half a second. The companion app carries no subscription fee, so the translation capability isn't gated behind a recurring payment.
What makes it genuinely useful is the mode list. Instead of one blunt "translate" button, you get AI Chat mode, Free Talk mode, Translation Machine mode, Headphones+Phone mode, Voice Notes mode (which converts recordings into meeting-note text), Photo Translation mode for reading text in images, Audio and Video Translation mode, and Simultaneous Interpretation mode. That spread covers the real situations people get stuck in: a face-to-face conversation, a lecture, a menu, a meeting, a video with no subtitles.
It's a three-in-one device too — translation, music playback and phone calls — with Bluetooth 5.4 and a large dynamic driver. So it's not useless as a normal earbud. Just don't expect it to compete with a music-first pair.
Who should buy it: travelers, students, academics, business people doing cross-border calls, and anyone chatting regularly with friends or family overseas. The open-ear clip-on C-bridge design, skin-friendly silicone, 5.1g per earbud and open-ear awareness make it comfortable for long stretches — and useful when you need to hear what's happening around you, like at an airport gate or on a street.
Who should skip it: if your priority is marathon battery life, active noise cancellation, or serious sound tuning, this isn't the tool. With 3 to 4.5 hours per charge, heavy all-day listeners will be reaching for the case often. The 3-month warranty is also short compared with what mainstream audio brands typically offer.
The Enco Air5s is the opposite kind of product: a mainstream true-wireless earbud that happens to include a translation extra. Its headline feature is Real-Time Adaptive Noise Cancellation built specifically for a semi-in-ear shape. An adaptive ANC algorithm analyzes your ear shape, your fit and your surroundings, then adjusts cancellation on the fly. A tailored voice-canceling acoustic structure and a triple-microphone AI call system keep your voice clear on calls in noisy places.
Battery is where it runs away from the IAMJOY: up to 48 hours of total playback with the charging case. That's the number that matters if you hate charging. IP55 dust and water resistance means sweat and rain aren't a problem, so it works for runs, commutes and gym sessions.
On audio, the hardware is more serious. A customized 12mm dynamic driver with a titanium-coated diaphragm is tuned for powerful bass, rich vocals and detailed highs. OPPO Alive Audio adds spatial sound, and a 10-band EQ with Sound Master presets lets you tune the signature yourself. Connectivity is current: Bluetooth 6.0, Dual Connection, Smart Bluetooth, Quick Pair and Spotify Tap across Android, iOS and Windows.
The fit is the other selling point. Each earbud weighs under 3.9g with an ergonomic semi-in-ear shape refined through ear-fit research — light enough to forget you're wearing them, which is exactly what 48-hour battery is for.
Who should buy it: commuters, gym-goers, remote workers on calls all day, and anyone who wants one pair of earbuds to do music, calls and noise control well. The AI Translate feature is a nice bonus for occasional needs.
Who should skip it: if translation is your actual reason for buying, skip it. AI Translate in the app is a convenience feature, not a 163-language interpreter with simultaneous interpretation and photo translation modes. The 24-month warranty is a strong point in its favor, though.
• Best for language translation → IAMJOY Language Translation Earbuds. 163 languages, 78 languages and 85 accents, 0.5s response, nine translation modes, no app subscription fee.
• Best for battery life → OPPO Enco Air5s. Up to 48 hours with the charging case versus a full day stretched from a 3–4.5 hour per-charge base.
• Best for noise cancellation → OPPO Enco Air5s. Adaptive ANC tuned for a semi-in-ear fit, plus triple-mic AI call clarity. The IAMJOY relies on open-ear awareness instead.
• Best for all-day comfort → OPPO Enco Air5s. Under 3.9g per earbud. The IAMJOY is close at 5.1g, but it uses a clip-on C-bridge rather than sitting in your ear.
• Best for staying aware of your surroundings → IAMJOY Language Translation Earbuds. The open-ear ring design lets ambient sound in — safer on streets and better for face-to-face conversation.
• Best for music quality → OPPO Enco Air5s. 12mm titanium-coated dynamic driver, OPPO Alive Audio spatial sound, 10-band EQ. The IAMJOY's driver is decent but not the point.
• Best for workouts and weather → OPPO Enco Air5s. IP55 dust and water resistance. Nothing in the IAMJOY sheet makes that claim.
• Best for study, travel and multilingual work → IAMJOY Language Translation Earbuds. Voice Notes, Photo Translation and Simultaneous Interpretation modes are built for exactly that.
In my opinion, these two barely overlap, so the decision is really about your main job for the earbuds. If translation is the reason you're shopping, I'd buy the IAMJOY Language Translation Earbuds — nothing in the OPPO's spec sheet comes close to 163 languages, 0.5s two-way translation and a free lifetime translation app. If you want one pair for music, calls, commuting and the gym, I'd buy the OPPO Enco Air5s: 48 hours of playback, adaptive ANC, IP55 and a 24-month warranty make it the more complete everyday earbud. Only pick OPPO for translation if you need it occasionally, not as your core tool.
FAQ
OPPO, clearly. The Enco Air5s claims up to 48 hours of playback with the charging case. The IAMJOY gives you 3 to 4.5 hours of continuous listening or translation, with the Type-C charging case extending it to a full day.
Only in a basic way. The Enco Air5s lists AI Translate as a convenience feature through its app. The IAMJOY supports 163 languages, 85 accents, nine translation modes and simultaneous interpretation — a different category of capability.
Both are light: under 3.9g per earbud for the OPPO, 5.1g for the IAMJOY. The OPPO uses a semi-in-ear fit; the IAMJOY uses an open-ear clip-on C-bridge with skin-friendly silicone, which keeps your ear canal open and lets you hear your surroundings.
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