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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want all-day music with active noise cancellation and a secure in-ear fit for long workouts, choose KALOC Headphones; if you need earbuds that can survive being fully submerged and stay comfortable without plugging your ear canal, choose DUOSSEAR F25B.
• KALOC Headphones — biggest strength: Up to 12 hours of play time and 250 hours of standby, plus CVC 6.0 noise reduction and active noise cancellation for calls and music.
• KALOC Headphones — biggest trade-off: It's an in-ear design with a plastic enclosure, so it relies on ear tips (XS/S/M/L included) for fit — some people never love that plugged feeling.
• DUOSSEAR F25B — biggest strength: IPX7 water resistance with a genuinely submersible build, titanium alloy ear hooks, and a no-in-ear air conduction design that leaves your ear canal open.
• DUOSSEAR F25B — biggest trade-off: The data sheet lists no battery life figure and no noise cancellation, so it's a simpler, more specialized sports tool than the KALOC.
• Who each pick is for: KALOC for the everyday listener who wants one headset for music, calls and workouts; DUOSSEAR F25B for swimmers, heavy sweaters and anyone who hates in-ear pressure.
The KALOC Bluetooth Headphones (model U8) are built around one idea: be the headset you wear for everything. Bluetooth 5.0 gives you a quick, stable pairing with roughly 10 meters of wireless range, so you can leave your phone on a bench and still control playback. The on-board buttons handle volume up and down, next and previous track, play and pause, and answering calls — meaning you rarely need to touch your phone mid-session.
Audio is handled by a dynamic driver, and KALOC pairs it with CVC 6.0 noise reduction plus active noise cancellation. That combination is aimed at call clarity and letting you focus on music in a noisy gym, on a busy street, or on a train. The battery side is where the KALOC makes its strongest case: up to 12 hours of listening and up to 250 hours of standby, with a 2-hour charge time. For most people that's a full week of workouts between charges.
On durability, KALOC uses an IPX7 rating with a nano-layer treatment to resist sweat and rain penetration. It's a genuine sports-first rating, and the package includes four ear tip sizes (XS, S, M, L), an earphone bag and a cable. It's an in-ear, plastic-enclosure design in green, sized for the 18–60 crowd. Who should buy it: anyone who wants one pair of wireless earbuds for running, the gym, commuting and calls, and who values battery life over everything. Who should skip it: if you dislike things sitting inside your ear canal for an hour at a time, or you mainly swim rather than run, this isn't the shape for you.
The DUOSSEAR F25B goes the other direction. Its headline claim is water: the title calls it IPX7 waterproof and submersible, and the feature list explicitly describes the ability to be soaked. That's a meaningful distinction from sweat resistance — an IPX7 submersible build is aimed at people who will actually get the earbuds wet, not just damp.
The second defining choice is the no-in-ear, air conduction design. Instead of sealing your ear canal with a tip, the F25B sits outside it and delivers sound through the air, held in place by titanium alloy ear hooks. If you've ever had earbuds slip out mid-run, or felt pressure and soreness after an hour of in-ear listening, that hook-based fit is the whole point. It also means you stay aware of traffic and surroundings, which matters for outdoor running and cycling.
The enclosure mixes metal and plastic in black, connectivity is wireless Bluetooth, and DUOSSEAR includes a one-year warranty description. Who should buy it: swimmers, people who train outdoors in rain or heavy sweat, and anyone who has given up on in-ear tips. Who should skip it: if you need active noise cancellation to block out a noisy commute, or you want a documented long battery figure to plan around, the F25B's data sheet simply doesn't offer either.
Side-by-Side: Which Should You Choose?
• Best for battery life → KALOC Headphones. Up to 12 hours of play time and 250 hours of standby is spelled out; the F25B lists no battery figure at all.
• Best for noise control → KALOC Headphones. Active noise cancellation plus CVC 6.0 noise reduction is a clear advantage for calls and loud environments.
• Best for ear comfort over long sessions → DUOSSEAR F25B. The no-in-ear air conduction design and titanium alloy hooks avoid ear canal pressure entirely.
• Best for fit security during vigorous movement → DUOSSEAR F25B. Ear hooks are the more locked-down shape; the KALOC relies on four ear tip sizes to stay put.
• Best for calls and button control → KALOC Headphones. Full on-earbud controls for volume, tracks, playback and calls, plus a mic.
• Best for staying aware of your surroundings → DUOSSEAR F25B. An open, no-in-ear fit doesn't block the world out the way a sealed tip does.
• Best all-rounder for one pair doing everything → KALOC Headphones. Music, calls, workouts and commuting in a single headset.
In my opinion, the KALOC Headphones are the better buy for most people, because the data sheet gives you more to work with: active noise cancellation, CVC 6.0 noise reduction, Bluetooth 5.0, four ear tip sizes, and a concrete 12-hour play time with 250 hours of standby. That's a headset that earns its place in your bag every day. I'd only steer you to the DUOSSEAR F25B if water is the deciding factor — if you swim, or you've never found an in-ear bud you can tolerate, its submersible IPX7 build, titanium alloy hooks and no-in-ear air conduction design solve problems the KALOC doesn't try to solve. Check the current price on Amazon for both before you commit, since the right pick often comes down to what you're paying today.
are headphones waterproof
Not all of them — it depends entirely on the rating. The KALOC Headphones carry an IPX7 rating and use a nano-layer treatment to resist sweat and rain, while the DUOSSEAR F25B is also IPX7 and explicitly described as submersible and soak-capable. Anything without an IPX rating should be treated as splash-prone at best.
are headphones water resistant
Many sports models are, and IPX7 is one of the stronger water-resistance levels you'll see on earbuds. Both the KALOC and the DUOSSEAR F25B are rated IPX7, which covers sweat, rain and, in the F25B's case, full submersion. That said, water resistance is not the same as unlimited waterproofing, so avoid pushing any pair beyond its stated rating.
For swimming, I'd pick the DUOSSEAR F25B. Its IPX7 rating is paired with a submersible, soak-capable design and a no-in-ear air conduction fit with titanium alloy hooks, which is a shape built for water and movement. The KALOC is rated IPX7 too, but it's positioned as a general sports and everyday headset rather than a pool-focused one.
Yes, effectively. The KALOC Headphones list active noise cancellation and CVC 6.0 noise reduction, while the F25B's data sheet lists no noise control feature at all. An open, no-in-ear design also lets ambient sound in by nature. If blocking out a noisy commute is a priority, the KALOC is the one to choose.
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