How We Research
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
• PSIER's biggest strength: 10 hours of playtime, Bluetooth 6.0, 60 ms low latency and a 200-hour standby — a genuinely all-day, low-lag wireless headphone for land sports.
• PSIER's biggest trade-off: IPX5 only means sweat and rain resistance, and the spec sheet explicitly says it is not suitable for underwater use. Pool swimmers should look elsewhere.
• Dnniakm's biggest strength: IPX8 waterproofing rated to 35 m depth plus 32 GB of built-in MP3 storage, so you can swim with music and no phone at all.
• Dnniakm's biggest trade-off: Underwater, Bluetooth is dead — you must double-click into MP3 mode, and the battery life is shorter at around 8 hours with an 8-hour charge time.
• Who PSIER is for: Runners, cyclists and gym-goers who want one lightweight headphone for land training and daily listening.
• Who Dnniakm is for: Swimmers, snorkelers and night runners who need water survival, offline storage or a rear safety light.
The PSIER X13 is built around a single idea: keep your ears open and your music on, all day. It uses a fully enclosed cavity design with bone conduction drivers, and PSIER claims the acoustic sealing cuts sound leakage by up to 50% compared with a typical open design. That matters if you listen in an office or on a quiet trail — less of your podcast bleeds out to the people around you. The 13 mm drivers with 90 dB sensitivity and 10 ohm impedance are aimed at a loud, balanced sound with crisp treble and clear mids, which is the profile most people want for pop, podcasts and audiobooks.
The fit story is the other half of the pitch. A flexible memory-titanium frame bends to your head instead of clamping it, and an included adjustable strap lets you size it for a smaller or larger head. At 23 grams, it is light enough that most people forget it is there on a long run. Because nothing enters the ear canal, there is no pressure build-up and no trapped sweat, which is exactly why open-ear designs have taken over the running category.
Dnniakm Swimming Headphones: Who It's For
The Dnniakm NOS08 is the opposite bet: it sacrifices some everyday polish to be the headphone you can actually take underwater. The IPX8 rating is the headline — Dnniakm describes Japanese waterproof technology supporting use at depths up to 35 meters, which covers lap swimming, snorkeling and general water sports. It is shaped to sit under a swim cap and alongside goggles, and the vibration driver sends sound through your cheekbone rather than your ear canal.
The catch is important and Dnniakm states it plainly: Bluetooth does not work underwater. Radio signals do not travel through water in any usable way, so once your head goes under, you switch to MP3 mode by double-clicking the power button. That is where the 32 GB of built-in storage comes in — enough for roughly 8,000 songs or audiobooks, played with no phone, no watch and no signal at all. You can also flip between sequential and shuffle playback with three presses of the power button. That offline mode is the whole reason this product exists, and it is the feature that separates it from almost every other bone conduction headphone.
Above water it behaves like a normal Bluetooth headphone: Bluetooth 5.4 with a 10 m (33 ft) range, dual-device pairing so you can hop between a laptop and a phone, iOS and Android support, and up to 8 hours of battery. The 23 g body uses a high-strength titanium alloy memory neckband with a soft liquid silicone finish, and the open-ear design keeps you aware of traffic. There is also a built-in rear safety light that Dnniakm says is visible from over 20 m — genuinely useful for night running and cycling. Dnniakm backs it with a 2-year after-sales service. The compromises: charge time is about 8 hours, and if you want premium wireless conveniences like low-latency video sync, that is not what this is tuned for.
Side-by-Side: Which Should You Choose?
• Best for swimming → Dnniakm Swimming Headphones. IPX8 rated to 35 m versus PSIER's IPX5, which is explicitly not for underwater use.
• Best for battery life → PSIER Bone Conduction Headphones. 10 hours of playtime and 200 hours of standby, with a 2-hour Type-C charge.
• Best for low-latency video and modern wireless → PSIER Bone Conduction Headphones. Bluetooth 6.0 with 60 ms latency is the better pick for phone or tablet video.
• Best for night visibility → Dnniakm Swimming Headphones. The integrated rear safety light is a feature PSIER simply does not offer.
• Best for long charge-free stretches → PSIER Bone Conduction Headphones. An 8-hour charge time on the Dnniakm is a real commitment.
• Best for all-day land training → PSIER Bone Conduction Headphones. Lighter on the spec sheet for running, cycling and gym use, with the higher playtime.
• Best for pool-and-gym dual use → Dnniakm Swimming Headphones. It handles both, as long as you accept MP3 mode in the water.
If I had to pick one for myself, I would buy the PSIER Bone Conduction Headphones. My training is on land — running, cycling, the gym — and 10 hours of playtime, Bluetooth 6.0 with 60 ms latency and a 2-hour charge fit that life better than an underwater-first design. The IPX5 rating covers sweat and rain, which is all I need.
That said, I would recommend the Dnniakm Swimming Headphones without hesitation to anyone who swims. If you want music in the pool, IPX8 waterproofing and 32 GB of offline MP3 storage are not nice-to-haves — they are the entire point, and PSIER cannot do it. Check the current price on Amazon for both before you commit, since that is the one number that should decide a close call.
how to bone conduction earphones work
Bone conduction drivers vibrate against the bone in front of your ear — the cheekbone on the Dnniakm, for example — and those vibrations travel to your inner ear directly. Your ear canal stays completely open, so you hear your music and the world around you at the same time. That is why both of these are described as open-ear designs.
how to wear bone conduction earphones
You rest the transducer pads against your cheekbones, just in front of your ears, and hook the band behind your head. The PSIER uses a memory-titanium frame with an adjustable strap so you can size it; the Dnniakm uses a titanium alloy memory neckband that flexes to fit. Neither goes inside your ear.
how to use bone conduction earphones
Pair over Bluetooth for normal listening — the PSIER runs Bluetooth 6.0 and the Dnniakm Bluetooth 5.4, both with a 10 m range. For swimming, the Dnniakm needs MP3 mode instead: double-click the power button to switch, because Bluetooth does not transmit underwater. Three presses of the power button toggles shuffle and sequential playback.
how are bone conduction earphones different from regular earbuds
They never seal or enter your ear canal, so there is no pressure and no blocked ambient sound — the main reason runners and cyclists use them. The Dnniakm adds IPX8 waterproofing and 32 GB of storage, while the PSIER adds 10 hours of playtime and 60 ms low latency. Both weigh 23 g.
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See also: Aiwa vs PSIER Bone Conduction Headphones: Bone Conduction, iClever HS25 vs PSIER Bone Conduction Headphones, ROPASOMIC Bone Conduction Headphones vs Vaparinckl Bone Conduction Hea