We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-24 · 6 min read · Independent comparison
If you want one pair of open-ear headphones that survives pool laps, sweaty climbs and long rides while playing music without a phone, choose RELAXYO Bone Conduction Swimming; if you need tiny in-ear buds that kill noise so you can sleep on your side or focus in a loud room, choose Kinglucky Sleep Earbuds. These two barely compete for the same job — they compete for the same moment. And the moment most people are actually shopping for is cycling.
• RELAXYO's biggest strength: an IP68 waterproof, open-ear design with 32GB of built-in storage, so it keeps playing music even when Bluetooth can't reach — underwater, or on a ride where you'd rather leave the phone at home.
• RELAXYO's biggest trade-off: it has no noise cancelling at all. Bone conduction sits outside your ear canal, so wind, traffic and road noise come straight in. That's the point for safety, but it's the opposite of quiet.
• Kinglucky's biggest strength: 50dB hybrid active noise cancellation in a 3.0g bud, with three modes (Sleep, ANC Focus, Transparency), a 50-hour total battery figure and a charging case.
• Kinglucky's biggest trade-off: it's not built for water, sweat or motion. In-ear silicone tips and a noise-cancelling focus are exactly what you don't want on a bike.
• For cycling: RELAXYO, clearly. For sleep, study and noisy commutes: Kinglucky. That's the whole decision in one line.
Start with the spec that matters most for a rider: IP68. That's the highest water-and-dust protection class in the model number, and it's the reason this thing is described as wearable while swimming, surfing, running, fishing or hiking — including under a swim cap or goggles. Sweat and rain aren't a threat to it; they're Tuesday. For cycling, that means you can ride through a downpour or a brutal summer climb and not baby the headphones.
The second piece is the 32GB of built-in storage. RELAXYO says that's roughly 7,000 songs, loaded by connecting the magnetic charging cable to a computer. You double-press the power button to switch between Bluetooth and MP3 mode. This is the feature that quietly changes how you ride: in MP3 mode there's no phone, no pairing, no signal to drop. Bluetooth 5.4 covers about ten meters in open space, but RELAXYO is upfront that Bluetooth can't transmit underwater — use MP3 mode there.
The design is open-ear bone conduction on a memory titanium frame, over-ear placement, in beige. Nothing goes inside your ear canal; the drivers vibrate against the bone in front of it. That's why it's comfortable for hours and why it stays stable when you bend and move — the frame flexes and springs back. Audio runs 20 Hz to 20,000 Hz, controls are three physical buttons (power in the middle, volume up/down on the sides, with the volume keys also handling track skip and the voice assistant), and you get 1.5 hours to charge for up to 7 hours of music.
Buy it if you cycle, swim, run or hike and want your ears open to traffic and your music independent of your phone. Skip it if you want silence, bass that hits, or something to wear to bed. There's no noise cancelling here, and the open design lets the world in on purpose.
This is a completely different animal. Kinglucky built an in-ear bud around 50dB hybrid noise cancellation — a triple-layer approach where soft silicone tips block physical noise like traditional earplugs, AI splits incoming sound by frequency, and ANC cancels the rest. Kinglucky frames that 50dB peak as the gap between a coffee shop and a library. Whether you take the number literally or not, the intent is obvious: maximum quiet in the smallest possible package.
The fit is the headline. Each bud weighs 3.0g, and the contact surface is a polished, ultra-soft silicone with a contoured shape meant to stay put while you roll around. Kinglucky also points to a sleep mode that shuts off notifications entirely, and says lab data shows users fall asleep faster in that mode. There's a Transparency mode for hearing your surroundings and an ANC Focus mode for work or studying — three taps to switch.
Battery is handled well for an overnight product: 1.5 hours to full via USB-C, over 7–10 hours per charge, 50 hours total with the case, plus an LED display showing the remaining power for both the buds and the case. Bluetooth 6.0 handles the connection, and the Kinglucky app adds 60 sleep sounds with three saveable favorites and a playback timer. Warranty is listed as 2 years, and the color is black.
Buy it if you're a side sleeper with aching ears, a light sleeper, a student or a traveler who needs a quiet bubble. Skip it if you want headphones for cycling, swimming or any activity where you need to hear traffic — in-ear ANC is the wrong tool for the road.
• Best for cycling → RELAXYO Bone Conduction Swimming. Open-ear keeps traffic audible, IP68 shrugs off sweat and rain, and MP3 mode means no phone needed on the bars.
• Best for swimming → RELAXYO Bone Conduction Swimming. IP68 plus 32GB of onboard music is the whole reason Bluetooth can't help you underwater.
• Best for sleep and side sleeping → Kinglucky Sleep Earbuds. 3.0g per bud, soft silicone contact surface, Sleep Mode and no notifications.
• Best for noise cancellation → Kinglucky Sleep Earbuds. 50dB hybrid ANC versus none on the RELAXYO. This isn't close.
• Best for battery flexibility → Kinglucky Sleep Earbuds. 50 hours total with the case, versus up to 7 hours per charge for RELAXYO. RELAXYO wins only if you count "no charging case to carry."
• Best for phone-free listening → RELAXYO Bone Conduction Swimming. 32GB of storage beats any streaming setup when there's no signal or no phone.
• Best for long-wear comfort with open ears → RELAXYO Bone Conduction Swimming. Memory titanium frame, over-ear, nothing inserted.
• Best for focus at a desk or on a plane → Kinglucky Sleep Earbuds. ANC Focus Mode and Transparency Mode cover both ends of that.
If I had to pick one, I'd buy the RELAXYO Bone Conduction Swimming — but only because my priority is riding. For a cyclist, the open-ear design is a safety feature, not a compromise: you hear cars, you hear your riding partner, and you still get music. IP68 means weather is irrelevant, and 32GB of storage means my phone can stay in my jersey pocket. In my opinion, the Kinglucky Sleep Earbuds are the better product for the job they were designed for — sleep and quiet focus — and if that's your job, buy those instead. The only wrong move is buying one for the other's purpose.
RELAXYO, without much debate. It's IP68-rated, open-ear and has 32GB of built-in storage so it plays without a phone. The Kinglucky is an in-ear noise-cancelling sleep bud — the wrong category for the road.
They're designed around sleep, side-sleeping and quiet focus, with silicone tips and a contoured in-ear fit. Nothing in the specs describes them as sweatproof or water-resistant, so I wouldn't treat them as workout gear.
Yes, but only in MP3 mode. Bluetooth can't transmit through water, so you switch modes and play from the 32GB of onboard storage. That's the same reason RELAXYO recommends MP3 mode for swimming.
Kinglucky on paper: over 7–10 hours per charge and 50 hours total with the charging case. RELAXYO gives you up to 7 hours of music after a 1.5-hour charge, with no case to extend it — though it also has no case to lose.
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See also: YouthWhisper Bone Conduction Headphones vs MyJoy Air Open Ear, MUSICOZY Sleep Headphones vs Kinglucky Clip-On Earbuds, MZYQCY Bone Conduction Headphones vs DUCOCUB Open Ear Earbuds