We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-27 · 6 min read · Independent comparison
If you want an everyday open-ear sports pair that handles sweat, rain and long outdoor sessions with calls and a fast top-up, choose mojawa Aerra IP67; if you need headphones that actually work underwater for lap swimming with built-in offline music, choose MARLALL Swimming Headphones-Bone Conduction.
• mojawa Aerra IP67 — biggest strength: a true all-rounder for land sports, with IP67 sealing, 8-hour battery, dual-device Bluetooth 5.2 pairing and ENC noise cancellation for calls.
• mojawa Aerra IP67 — biggest trade-off: it is not built for swimming, and its 8-hour runtime is modest next to the MARLALL's 30 hours.
• MARLALL Swimming Headphones-Bone Conduction — biggest strength: IP68 waterproofing plus 32 GB of onboard MP3 storage, so you can listen underwater without any Bluetooth signal.
• MARLALL Swimming Headphones-Bone Conduction — biggest trade-off: underwater playback only works in MP3 mode, and the microphone needs drying after a swim before calls sound right.
• Who each pick is for: the mojawa Aerra IP67 suits runners, cyclists and commuters who want one pair for everything dry; the MARLALL suits pool and open-water swimmers who want music in the water.
The Aerra is the pair I would hand to someone whose training happens on land. The open-ear design sits outside the ear canal, so you keep awareness of traffic, other runners and your surroundings while still hearing your music. There is no insertion and no pressure, which matters on long sessions where in-ear buds start to ache.
What stands out in the specs is how complete it is for that job. The IP67 rating means the body is fully sealed, so heavy sweating or getting caught in the rain is a non-issue. The 5.2 Bluetooth connection can hold two devices at once, which is genuinely useful if you want your phone and a laptop or watch paired without re-pairing every time you switch. Add the three EQ modes — Equalizer, Bass Boost and Vocal Enhancement — plus the Audio-Haptics system for low-frequency rhythm, and you have a pair tuned to be flexible rather than one-note.
MARLALL Swimming Headphones-Bone Conduction: Who It's For
The MARLALL is a specialist, and it is refreshingly upfront about it. The key detail is the warning repeated throughout the specs: Bluetooth does not travel through water, so underwater listening runs in MP3 mode only. That is why the 32 GB of internal memory exists — you load your playlists onto the headphones themselves (the magnetic charging cable doubles as a computer connection for managing that storage) and then swim with no phone, no signal and no dropouts. The brand claims space for up to 8,000 songs.
The IP68 rating is the other pillar. It covers immersion, sweat, rain and dust, and the nano-coated sealed design protects the internals while the liquid silicone build stays skin-friendly against salt and pool water. The 22.68 g weight is very light, and the titanium-and-silicone construction is aimed at staying put through laps, dives and hard workouts without pressure points. Battery is a genuine strength: 30 hours of average life and a 2-hour charge time, which is a much bigger buffer than the mojawa offers.
Two things to plan around. First, the microphone: the specs explicitly say to dry it after swimming, otherwise calls suffer — so treat it as a music-and-swim tool first, a calling tool second. Second, the Bluetooth 5.4 radio is strong and stable up to about 10 metres for dry-land use like running and cycling, but the moment you submerge, you are in MP3 mode. If you want one pair that handles gym, commute and calls seamlessly and you never swim, the extra storage and the mode-switching are complexity you do not need.
Side-by-Side: Which Should You Choose?
• Best for swimming → MARLALL Swimming Headphones-Bone Conduction. IP68 immersion protection plus 32 GB MP3 mode is the only way to get music underwater here.
• Best for battery life → MARLALL Swimming Headphones-Bone Conduction. 30 hours versus 8 hours on the mojawa.
• Best for rain and heavy sweat on land → mojawa Aerra IP67. The sealed IP67 body is built for exactly that.
• Best for minimal fuss → mojawa Aerra IP67. No mode switching, no playlist loading, just pair and go.
• Best for multi-device users → mojawa Aerra IP67. Bluetooth 5.2 dual connection lets you hold two devices at once; the MARLALL specs describe single-device Bluetooth use.
• Best for music customisation → mojawa Aerra IP67. Three selectable audio modes versus a fixed tuning.
• Best for pool-to-gym crossover → MARLALL Swimming Headphones-Bone Conduction. It swims, and it still runs Bluetooth 5.4 on dry land for workouts.
In my opinion, most people shopping this category are runners, cyclists and gym-goers who occasionally get rained on — not lap swimmers. For them I would buy the mojawa Aerra IP67. It does the everyday job properly: sealed against sweat and rain, comfortable open-ear fit, real call quality and dual-device pairing. The MARLALL is the better product only if you genuinely swim, because nothing else in this comparison gets music to you underwater. If swimming is your main sport, buy the MARLALL and accept the MP3 workflow. If it is not, the Aerra is the simpler, more complete daily pair.
how to bone conduction earphones work
Bone conduction drivers sit against your cheekbone rather than inside your ear canal and send vibrations through the bone to your inner ear. That is why both headphones here use a bone conduction driver and keep your ears open to the world around you.
how to wear bone conduction earphones
Rest the transducers on the bone just in front of your ear, with the band running behind your head. The mojawa Aerra IP67 uses an open-ear fit with no insertion, and the MARLALL uses a lightweight silicone build that conforms around the ear for a secure, low-pressure hold.
how to use bone conduction earphones
Pair them over Bluetooth as normal — the Aerra uses Bluetooth 5.2 with dual-device connection, the MARLALL uses Bluetooth 5.4. The one exception is swimming: underwater you must switch the MARLALL to MP3 mode and play from its 32 GB of internal storage, because Bluetooth signals cannot travel through water.
how are bone conduction earphones different from regular earbuds
They never block your ear canal, so you stay aware of traffic, teammates and surroundings while you listen. The trade-off is that you do not get the passive noise isolation of sealed earbuds — neither of these offers active noise cancellation, though the mojawa Aerra IP67 does add ENC noise cancellation for calls.
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