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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-28 · 7 min read · Independent comparison
• Amazon Renewed Srhythm NC25 — biggest strength: over-ear active noise cancelling with 40mm drivers, a 3.5mm cable for wired listening, and multi-point connection for switching between two devices.
• Amazon Renewed Srhythm NC25 — biggest trade-off: it's a renewed unit with a 90-day limited warranty, and the bulky over-ear frame is the opposite of pocketable.
• occiam Sport Earbuds — biggest strength: up to 96 hours of total playback with the charging case, plus earhooks and a sweat-resistant build made for movement.
• occiam Sport Earbuds — biggest trade-off: sound isolation rather than true active noise cancelling, and a 9.14 m Bluetooth range that keeps your phone close.
• Choose the Amazon Renewed Srhythm NC25 if you want to block out engine noise and work or listen for hours with a wired backup.
• Choose the occiam Sport Earbuds if you want something tiny, secure and sweat-proof for the gym, running and daily errands.
The NC25 is an over-ear headphone built around one clear idea: quiet. Active Noise Cancellation works in both wired and wireless mode, which matters more than it sounds. On a plane or a noisy train, you can plug in the included 3.5mm cable and keep the ANC running even when the battery is flat. That single design decision makes it a genuinely useful travel headphone rather than a toy that dies halfway through a long trip.
Inside, you get 40mm dynamic drivers tuned for deep bass, a dual-microphone system for hands-free calls, and Bluetooth 5.0/5.3-class wireless with multi-point connection so you can jump between a laptop and a phone without repairing. The 50ms low-latency game mode is aimed at people watching video or gaming, where audio lag is obvious. It's also rated at 32 ohm impedance, which is friendly to phones and laptops without a separate amp.
The physical design is where it earns its keep for commuters. It weighs 180 g — about 0.4 lb — folds up, and uses protein leather ear pads with 115° swiveling ear cups. Srhythm also designed a replaceable ear pad system and an air-pressure-balance feature intended to reduce the "cabin pressure" feeling some people get from ANC. Battery is listed at 16 hours of music or talk time per charge with a 2-hour charge time, and the wired cable covers you beyond that.
Who should buy it: frequent flyers, commuters, remote workers on calls, students in loud dorms, and anyone who wants one headphone for both wireless and wired listening.
Who should skip it: runners and gym-goers who need something that won't slide around, people who want a tiny case in their pocket, and shoppers who are uncomfortable with renewed hardware. This is a renewed item carrying a 90-day limited warranty, so if long-term coverage matters more than design and features, a new unit is the safer emotional choice.
The occiam Sport Earbuds are the opposite philosophy: disappear into your ears and never fall out. The headline number is 96 hours of total playback with the charging case. That's not 96 hours in one sitting — it's the case plus buds working as a system, and it means you can go weeks of gym sessions without hunting for a cable. For anyone who has ever finished a workout with one earbud dead, that's the whole pitch.
The fit is the second pillar. Ergonomic earhooks plus an in-ear shape mean these are designed to stay put during running, lifting and anything bouncy. The enclosure is ABS plastic, the color is Light Blue, and the construction is described as sweat-resistant — a meaningful distinction from waterproof, so treat sweat and light rain as fine, swimming and full submersion as not.
Audio comes from 13mm dynamic drivers with a 20 Hz – 20 kHz frequency range, 32 ohm impedance, 92 dB sensitivity and a bass-forward tuning. Bigger drivers in an in-ear shell generally mean more low-end thump, which is exactly what most people want for a workout playlist. There's a built-in microphone and touch controls for calls, playback and volume, and Bluetooth 5.3 with a stated range of about 9.14 m — roughly room-sized, so don't wander far from your phone.
In the box you get the earbuds, charging case, ear tips, a Type-C charging cable and a manual, backed by a 2-year warranty. Total kit weight is 148 g, which includes the case.
Who should skip it: people who want real active noise cancelling for flights, anyone who prefers over-ear comfort for multi-hour listening, and listeners who need a wired option when the battery runs out — there isn't one here.
Side-by-Side: Which Should You Choose?
• Best for noise cancelling → Amazon Renewed Srhythm NC25. Active Noise Cancellation works in both wired and wireless mode; the occiam pair relies on passive sound isolation only.
• Best for battery endurance → occiam Sport Earbuds. Up to 96 hours of total playback with the case versus 16 hours per charge on the NC25.
• Best for workouts and running → occiam Sport Earbuds. Earhooks, an in-ear fit and a sweat-resistant build are purpose-built for movement.
• Best for flights and commuting → Amazon Renewed Srhythm NC25. Over-ear cups, ANC and the 3.5mm cable make it the better travel companion.
• Best for calls and multi-device work → Amazon Renewed Srhythm NC25. Dual noise-rejecting microphones and multi-point connection let you switch between two devices.
• Best for gaming and video → Amazon Renewed Srhythm NC25. The 50ms low-latency mode targets lip-sync problems the occiam buds don't address.
• Best for low-maintenance ownership → occiam Sport Earbuds. A 2-year warranty beats the 90-day limited warranty on the renewed NC25.
• Best for pocketability → occiam Sport Earbuds. A charging case slips into a pocket; a folding over-ear headphone does not.
In my opinion, the right pick comes down to where you'll use them most, not which one is "better." If your listening happens on planes, trains, buses or at a desk, I'd buy the Amazon Renewed Srhythm NC25 — active noise cancelling that survives a dead battery thanks to the wired mode is a genuinely rare combination, and the multi-point connection and low-latency mode cover work and video too. If your listening happens with sweat on your forehead, I'd buy the occiam Sport Earbuds — the earhook fit and 96-hour case life are built for exactly that. For a single purchase that has to serve both, the NC25 is the more versatile tool; the occiam pair is the better specialist.
That depends on how you feel about renewed hardware. The NC25 gives you over-ear ANC, 40mm drivers, a wired 3.5mm option and multi-point Bluetooth, but it's a renewed unit with a 90-day limited warranty instead of a full-length one. If the feature set is what you want, it's a reasonable route — just check the current price on Amazon, since renewed listings move around.
No. occiam lists sound isolation, not active noise cancelling. The in-ear seal blocks some surrounding noise, but it won't do what the NC25's ANC does on a plane or a loud commute. If blocking engine drone is your goal, the over-ear option is the one to pick.
By the numbers, the occiam Sport Earbuds: up to 96 hours of total playback with the charging case, against 16 hours of music or talk time per charge on the NC25. But the NC25 can run passively over its 3.5mm cable when the battery dies, which the occiam buds can't do at all.
Yes to both. They include a built-in microphone with touch controls for calls, playback and volume, and the earhook plus sweat-resistant build is aimed at gym and running use. Just keep your phone within roughly 9.14 m, which is the stated Bluetooth range.
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