How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-17 · 6 min read · Independent comparison
• CCA KZ AS16 — biggest strength: Eight balanced-armature drivers per side with a three-way electronic crossover, covering 20Hz–40kHz for detail-heavy, high-clarity listening.
• CCA KZ AS16 — biggest trade-off: It is a wired 3.5mm in-ear monitor with passive sound isolation only — no Bluetooth-only freedom, no water rating, no built-in music storage.
• SANOTO Swimming Headphones — biggest strength: IPX8 waterproofing rated for submersion up to 10 meters for over two hours, plus a built-in 8GB MP3 player with up to 12 hours of playback.
• SANOTO Swimming Headphones — biggest trade-off: Underwater listening depends on switching to MP3 mode, and its button controls with no active noise control keep things simple rather than audiophile-grade.
• Pick CCA KZ AS16 if you're a musician, singer, DJ, drummer or gamer who wants accuracy and isolation.
• Pick SANOTO Swimming Headphones if you swim, surf, dive or train in water and want music in the pool.
The CCA KZ AS16 is built around a flagship-style driver array: eight balanced armatures per ear, split into four high-frequency units, two mid-frequency units and one low-frequency unit, all managed by an electronic three-way crossover. In plain terms, that layout is about separation — vocals sitting apart from instruments, highs staying extended, and bass staying controlled instead of smearing over everything else. The claimed frequency range runs from 20Hz to 40kHz, which is far wider than the audible range, and at 15 ohm impedance it's an easy load for a phone, dongle or interface to drive.
Physically, it's a wired in-ear monitor with a 3.5mm jack, a metal-and-plastic shell in a cyan finish, rounded tips and a stated weight of 0.08 kg. The cavity is molded to sit deep in the ear canal, which is what lets CCA claim up to 26dB of noise isolation. That matters more than it sounds: on a stage, in a rehearsal room, or on a noisy commute, isolation is what lets you hear the mix at lower volumes. Touch controls handle media playback, so you're not fishing for a phone.
SANOTO Swimming Headphones: Who It's For
The SANOTO S710 solves a specific problem: how do you hear music while your head is underwater? Bluetooth can't help you there, because the 2.4GHz band it uses gets absorbed by water — which is exactly why SANOTO tells you to switch to MP3 mode when swimming and turn the phone's Bluetooth off. That's not a gimmick, it's physics. So the S710 is a two-in-one device: a Bluetooth 5.4 headset for land, and a standalone 8GB MP3 player for the water, holding roughly 1,500 tracks across MP3, FLAC, WMA, WAV and APE files. Double-click the function key to switch modes.
The other half of the story is durability. IPX8 means it can be submerged up to 10 meters for more than two hours, which covers swimming, surfing and diving, plus sweat and rain. The ear hooks are skin-friendly silicone that flex to different head shapes and are designed to work alongside swim caps, goggles and earplugs — and because they seat in the ear canal, they also help keep water out. Sound comes from a bone conduction driver paired with a 360° closed sound cavity, vibration technology and anti-leak acoustics, tuned for clarity underwater rather than audiophile accuracy.
Battery life is stated at 12 hours in MP3 mode and 8 hours in Bluetooth mode, with a 2-hour charge via the included magnetic cable. In the box you get the headphones, two magnetic charging cables, ten replacement ear tips and an adjustable elastic strap, plus a one-year replacement-or-refund warranty. Controls are push buttons, and there's no noise cancellation.
Who should buy it? Swimmers, surfers, divers and anyone doing wet outdoor training who wants music without carrying a phone into the water. Who should skip it? If you want maximum fidelity, wired reliability or active noise cancellation, this isn't the pick — it's a rugged water tool first and a headphone second.
Side-by-Side: Which Should You Choose?
• Best for water use → SANOTO Swimming Headphones. IPX8, submersible to 10 meters for over two hours.
• Best for noise isolation → CCA KZ AS16. Up to 26dB of passive isolation from the molded in-ear fit; the SANOTO has no noise control at all.
• Best for listening without a phone → SANOTO Swimming Headphones. Built-in 8GB storage and a dedicated MP3 mode.
• Best for zero-latency, wired setups → CCA KZ AS16. A 3.5mm jack means no pairing, no codec delay, no charging.
• Best for long sessions away from a charger → SANOTO Swimming Headphones. Up to 12 hours in MP3 mode on a 2-hour charge.
• Best for stage, studio and gaming → CCA KZ AS16. Its tuning and touch media controls suit monitoring and competitive play.
• Best for swim caps, goggles and earplugs → SANOTO Swimming Headphones. Flexible silicone ear hooks designed to fit around that gear.
• Best for effortless driving from any device → CCA KZ AS16. At 15 ohm, almost anything with a headphone jack can power it.
In my opinion, these two aren't really competing — they're answers to different questions. If I had to buy one, I'd buy the CCA KZ AS16 for anything that happens on dry land: practicing, performing, gaming or just listening closely, its eight-driver setup and 26dB isolation give you the kind of detail a single-driver headphone can't. But I'd only recommend the SANOTO Swimming Headphones to someone who genuinely needs music in the water, because that's the one job nothing else on this list does. Buy for your environment, not for the spec sheet.
FAQ
Yes. Bluetooth 5.4 works on land with a 10-meter range, and you get up to 8 hours of playback that way. Just remember to switch to MP3 mode before going underwater, since Bluetooth signals don't travel through water.
They're tuned for different jobs. The CCA KZ AS16 is built for accuracy and detail with balanced armature drivers and a wide frequency range, while the SANOTO prioritizes clear, focused audio underwater through its closed cavity and vibration technology. For critical listening I'd choose the CCA; for swimming, the SANOTO.
I don't quote prices here because they change often — check the current price on Amazon using the button on this page. On value, the SANOTO bundles 8GB storage, extra ear tips, two charging cables and a one-year warranty, while the CCA is a pure listening tool. Which is better value depends entirely on whether you swim.
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