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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 · 6 min read · Independent comparison
If you want marathon battery life, a genuinely waterproof build and the lightest possible fit, choose coioc Open-Ear Headphones; if you need a smart charging case, a next-gen Bluetooth chip and adjustable earhooks, choose JKNKCO NE80. That's the whole decision in one line — everything below is just me showing my work.
• coioc's biggest trade-off: the charging case is a plain LED display model, so you get battery info but nothing interactive; no adjustable hook angle is specified either.
• JKNKCO's biggest strength: a full-color smart screen case that controls playback, battery status, themes and a "Find My Earphones" feature, plus 120° adjustable elastic earhooks and Bluetooth 6.0.
• JKNKCO's biggest trade-off: 4 hours of single-use playtime and an IPX5 rating, which is splash-resistant rather than submersible.
• Buy coioc if your priority is endurance, rain-and-sweat confidence and featherweight comfort for running and gym work.
• Buy JKNKCO if you want gadget-forward features, a tunable fit and low-latency wireless for video and gaming.
The coioc pair, sold as the OW08, is built around one idea: stay on your ears forever and don't make you think about them. The headline number is 50 hours of total playback between the earbuds and the charging case, with a Type-C port for fast charging. In practice that means you can treat these like a weekly-charge device rather than a nightly one. If you've ever had earbuds die on the last kilometre of a long run, that figure is the entire pitch.
The second big spec is IPX7. That's a genuine waterproof rating applied to the internal components via nano-coating, so sweat, rain and the occasional soaking won't kill them. Combine that with an open-ear design that leaves your ear canal completely unobstructed, and you have a pair aimed squarely at runners, cyclists and gym-goers who need to hear traffic, training partners or gym announcements. Each earbud weighs 8 grams, which is lighter than a standard key — light enough that the ergonomic earhook does the holding rather than pressure inside your ear.
Audio comes from 14.2mm dynamic drivers paired with a dedicated amplifier chip and an acoustic tuning algorithm, with a 16 ohm impedance. Bluetooth 5.4 handles pairing and connection stability in crowded places, and touch controls cover music, volume, calls and voice assistants. There's also active noise cancellation listed in the control specs, which is unusual for an open-ear set and worth knowing about.
Who should skip it? If you want a charging case that does something clever, or you like the idea of physically adjusting your earhook angle for a perfect fit, coioc gives you neither. It's the practical, understated option — and that's exactly why some people will prefer it.
The NE80 is the showier of the two, and it leads with its case. That charging case has a full-color smart screen that lets you control music playback, check battery status, switch themes and trigger a "Find My Earphones" function without touching your phone. It even carries a built-in list of 134 languages. If you've ever lost an earbud under a car seat, that find-my feature alone might settle this for you.
The fit story is different too. JKNKCO uses 120° adjustable elastic earhooks, so you rotate the hook to match your ear shape rather than accepting a fixed angle. That's a real advantage for people who've never found open-ear hooks comfortable out of the box. The rest of the design is conventional: touch controls, a dynamic driver, and DRC Dynamic Low Frequency Compensation paired with a bio-diaphragm coil to push bass harder than a typical open-ear set manages.
Connectivity is the other headline. Bluetooth 6.0 is a newer generation than coioc's 5.4, and JKNKCO claims a 90% increase in transmission speed, 68% stronger anti-interference and a 60% reduction in latency. Take manufacturer percentages with the usual pinch of salt, but the direction is real: lower latency matters for gaming and lip-sync during video.
Where it gives ground is endurance. Single-use playtime is 4 hours, with a 1.5-hour fast charge, and the case extends total listening beyond that. The IPX5 rating handles sweat and rain but won't survive submersion. Dual microphones with noise and wind filtering are aimed at outdoor calls, which is a sensible focus for an open-ear product.
Skip the NE80 if you want to charge once a week or swim-adjacent durability. Buy it if the smart case, adjustable hooks and low-latency connection are things you'd actually use.
• Best for battery life → coioc Open-Ear Headphones. 50 hours total versus 4 hours per charge on the NE80.
• Best water resistance → coioc Open-Ear Headphones. IPX7 versus IPX5 — the difference between surviving a downpour and merely tolerating sweat.
• Best for long runs and races → coioc Open-Ear Headphones. Lightweight 8g buds plus that playtime figure is a distance-runner's spec sheet.
• Best for fit customization → JKNKCO NE80. The 120° adjustable elastic earhooks let you tune the angle; coioc specifies ergonomic hooks without an adjustment range.
• Best for gadget lovers → JKNKCO NE80. The full-color smart screen case with playback control, themes and Find My Earphones is a genuinely different experience.
• Best for gaming and video → JKNKCO NE80. Bluetooth 6.0 with a stated latency reduction matters more here than raw battery.
• Best for bass-forward listening → JKNKCO NE80. DRC low-frequency compensation is explicitly designed to add punch; coioc emphasizes clarity and detail instead.
• Best for people who lose things → JKNKCO NE80. The find-my-earbuds feature is the kind of thing you only appreciate after the first panic.
In my opinion, the coioc Open-Ear Headphones are the safer buy for most people. Fifty hours of playtime and IPX7 waterproofing solve the two problems that actually ruin open-ear earbuds in daily life — running out of charge and dying from sweat. The 8-gram weight and open design round out a package that just gets out of your way.
I'd point you to the JKNKCO NE80 only if the smart screen case, the adjustable hooks or Bluetooth 6.0's low latency are features you'd genuinely use every week. It's the more interesting product; coioc is the more dependable one. If you're still torn, check the current price on Amazon before deciding — that's often the tiebreaker.
FAQ
For running specifically, yes, in my view. The IPX7 rating and 50-hour total playtime are better suited to heavy sweat and long sessions than the NE80's IPX5 and 4-hour single-charge figure.
They emphasize different things rather than one being plainly better. JKNKCO uses DRC Dynamic Low Frequency Compensation for stronger bass, while coioc uses 14.2mm drivers and a dedicated amplifier chip tuned for clarity and detail. Bass lovers should lean JKNKCO; detail lovers should lean coioc.
JKNKCO's case is far more advanced — a full-color smart screen with playback control, battery display, themes and a Find My Earphones function. coioc's case uses a simpler LED digital display for battery and charging status.
If you game or watch a lot of video, the lower latency JKNKCO advertises is a meaningful advantage. For music, podcasts and calls, Bluetooth 5.4 on the coioc is entirely adequate in everyday use.
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