How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-05 · 6 min read · Independent comparison
• MARLALL's biggest strength: a 30-hour average battery life and Bluetooth 5.4, which makes it the more forgiving pick for long days, including back-to-back call center shifts.
• MARLALL's biggest trade-off: underwater it only works in MP3 mode — Bluetooth can't transmit through water — and the mic needs drying after a swim before calls sound right.
• DEMICEA's biggest strength: a very light build (about 0.99 oz) with a flexible memory Ti-alloy frame and a 16mm bone conduction driver, which suits all-day sport comfort and sunglasses wear.
• DEMICEA's biggest trade-off: an 8-hour average battery life and a stated 2-day charge time, so it's a workout companion rather than an all-day headset.
• Who each is for: MARLALL for swimmers, marathoners and anyone who wants long battery between charges; DEMICEA for runners and gym users who prize low weight and quick top-ups.
The MARLALL set is the specialist here. It's an open-ear, bone conduction design with a silicone and titanium build in Platinum Silver, weighing about 22.68 grams. The headline spec is IP68 waterproofing, which the data sheet describes as protecting against water immersion, sweat, rain and dust — covering swimming with caps or goggles, snorkeling and boating. The nano-coated sealed design is meant to keep the internals safe while the liquid silicone stays skin-friendly.
Battery is the other standout: 30 hours average life from a 2-hour charge, paired with Bluetooth 5.4 and a roughly 10-meter range. That combination is what makes it interesting beyond the pool. If you're running a call center desk, a headset that lasts 30 hours and reconnects reliably across iOS and Android is genuinely useful — and the built-in 32GB of MP3 storage (roughly 8,000 songs) means you can work or train without your phone. The magnetic charging cable also lets you connect to a computer to manage playlists.
The trade-offs are real. There's no active noise control on either set, and the data sheet is explicit that Bluetooth doesn't work underwater — you switch to MP3 mode. The mic also needs drying after a swim to keep calls clear. Who should buy it: swimmers, marathon runners, and anyone who wants the longest battery life in this comparison. Who should skip it: if you want the lightest possible frame or you rarely go near water, the extra swimming focus isn't doing much for you.
DEMICEA's Open Ear Sport (model LibreRun X6, Maroon Red) leans into comfort and sport sound. At about 0.99 oz, with a 0.7mm flexible memory Ti-alloy frame and skin-friendly silicone on the rear bridge, it's built for long wear with balanced weight distribution — and the data sheet notes it doesn't get in the way of sunglasses. Soft silicone cushions sit at the front of the ear for a gentle fit.
Audio is the other focus. A 16mm bone conduction driver is paired with directional sound field technology meant to keep audio from leaking, plus an audio power amplifier and dedicated processing to clean up interference. It supports AAC and SBC, and Bluetooth 5.3 with a stated 10-meter range. Like the MARLALL, it carries 32GB of built-in storage (over 4,000 songs) and IP68 protection against sweat, rain and swimming, using a sealed design and nano-hydrophobic coating.
Power is where it differs. DEMICEA lists up to 8 hours of music from a 2-hour charge, plus a 5-minute quick charge for about half an hour of playback. That quick top-up is handy before a run. Who should buy it: runners, gym users and cyclists who want a light, secure frame and fast charging. Who should skip it: if you need a headset to last through a full call center shift without recharging, 8 hours is the weak point.
• Best for battery life → MARLALL Swimming Headphones-Bone Conduction (30 hours average vs 8 hours).
• Best for the lightest fit → DEMICEA Open Ear Sport (about 0.99 oz with a flexible memory Ti-alloy frame).
• Best for swimming → MARLALL, which is explicitly designed around pool use with caps or goggles — though both are IP68 and both require MP3 mode underwater.
• Best for quick top-ups → DEMICEA, with a 5-minute charge giving roughly 30 minutes of playback.
• Best for a call center desk → MARLALL, purely on battery and Bluetooth 5.4 stability across a long shift.
• Best for sunglasses wearers → DEMICEA, which states its fit works alongside sunglasses.
• Best for playlists without a phone → a tie. Both offer 32GB of built-in storage and a magnetic cable for loading music from a computer.
• Best for sound-focused sport listening → DEMICEA, with its 16mm driver, directional sound field and interference-cleaning processing.
If I were buying one, I'd take the MARLALL Swimming Headphones-Bone Conduction. For my money, the 30-hour battery and Bluetooth 5.4 make it the more versatile everyday headset — it covers swimming, marathons and long call center shifts without a mid-day charge. The DEMICEA is the nicer running companion if low weight and quick charging matter more to you than endurance. In my opinion, endurance wins for most people. Check the current price on Amazon before you commit. Either way, the 32GB storage means you can leave your phone behind.
FAQ
how to bone conduction earphones work
They sit outside the ear canal and send vibrations through the cheekbone to the inner ear, so your ears stay open. Both sets here use bone conduction drivers, and both keep you aware of traffic, pool users and coworkers around you.
Rest the transducers on the bone just in front of your ears, with the band around the back of your head. The MARLALL's liquid silicone seal and the DEMICEA's 0.7mm memory Ti-alloy frame are both designed to hold that position during movement.
how to use bone conduction earphones
Pair over Bluetooth for calls and music, or load tracks into the built-in 32GB storage and switch to MP3 mode — which is required underwater, since Bluetooth can't transmit through water on either model.
how are bone conduction earphones
They're open-ear, so they don't seal out sound and typically don't include active noise cancelling — neither model here does. That's the point: better awareness and comfort, at the cost of isolation in loud places.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.
See also: JustJamz Earbuds Bulk Bits vs xinwld Earbuds, Baseus Bowie MC1 vs Aune AC45: Hi-res Headphones, iKmai Earbuds vs Rulbovs NE92: In Ear Noise Cancelling, NEARITY MemPod Fit 2 vs HiBOMASOON Swimming Headphone Underwater