We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-17 · 7 min read · Independent comparison
If you want one pair of headphones that survives full submersion in a pool and plays music without your phone, choose ELYXFUL Bone Conduction Swimming; if you need something to silence a snoring partner and let you sleep on your side, choose Kinglucky Sleep Earbuds. These two products share almost nothing except the word "headphones." One is built around water and movement. The other is built around silence and stillness. Here's how to tell which one belongs in your life.
• ELYXFUL's biggest strength: IP68 waterproofing plus a 64GB built-in MP3 player, so you can swim laps with music and no phone anywhere near the water.
• ELYXFUL's biggest trade-off: Open-ear bone conduction means no noise isolation at all — you hear the pool, the gym, the traffic. That's the point on a bike, less ideal when you want quiet.
• Kinglucky's biggest strength: 50dB hybrid active noise cancellation with a dedicated Sleep Mode, built specifically for side sleepers who want silence.
• Kinglucky's biggest trade-off: These are not waterproof and not meant for swimming. Sweat and rain are one thing; a lap pool is another.
• Choose ELYXFUL if your workout happens in water or you want your ears open to your surroundings.
• Choose Kinglucky if your priority is blocking noise so you can sleep, focus or travel in peace.
The ELYXFUL BCE is a sport-first design. The wraparound frame rests on your temples rather than inside your ear canal, and the audio driver is bone conduction, so sound reaches you through your cheekbones. The frequency range sits at 200 Hz – 20,000 Hz with an 8-ohm impedance, which tells you this is tuned for clarity and speech rather than chest-thumping bass. That's a normal trade-off for bone conduction, and it's worth knowing before you buy.
What makes it unusual is the combination of IP68 waterproofing and a built-in 64GB MP3 player. That's the real story here. You load your music onto the headphones themselves and leave your phone in your bag — or your locker — while you swim. It also runs Bluetooth 5.3 with a 33-foot range and a built-in mic, so outside the pool it behaves like a normal wireless headset for calls and streaming. You switch between MP3 and Bluetooth modes with the push-button controls, which also handle volume and track skipping, and you can do all of that mid-workout without stopping.
Battery life is rated at up to 8 hours with a 2-hour charge time. The box includes two sets of USB-C charging cables with an extension cable, two sets of waterproof silicone earplugs, and a carrying pouch. The earplugs matter more than they look — plugging your ears while using bone conduction is how you get fuller, louder audio underwater, because you're cutting out the water noise competing with the sound. The fit is designed to stay put through flip turns and sprints, and it's meant to sit comfortably under a swim cap and around goggles.
Who should buy it: lap swimmers, open-water swimmers, triathletes, and anyone who runs or cycles and wants their ears open to traffic. The 2-year manufacturer warranty and the sporty, temple-resting design back that up.
Who should skip it: anyone who wants to block out noise. There's no noise control here at all — that's deliberate, but if you're buying headphones to escape a loud office or a snoring bedmate, this is the wrong tool. It's also not the pick if you want deep, isolating bass.
The Kinglucky i99 is solving a completely different problem: getting to sleep, and staying there. It's an in-ear design with hybrid active noise cancellation rated at 50dB peak, achieved through three layers — silicone tips that physically block sound like earplugs, AI that splits incoming noise by frequency, and ANC that cancels the remainder. There's also a Sleep Mode that shuts off notifications and distractions entirely. In my opinion, that combination of passive isolation plus active cancellation is what makes it credible for light sleepers rather than just another pair of ANC buds.
The side-sleeper angle is where the engineering shows. The buds weigh about 3 grams, with a polished silicone contact surface and a contoured shape meant to sit flush so pillow pressure doesn't dig into your ear. That weight figure matters because side sleepers feel every extra gram once their head is on a pillow.
Battery is rated at over 7–10 hours per charge and a total of 50 hours with the charging case, with a 1.5-hour USB-C charge and an LED display showing remaining power for both the buds and the case. There's also a companion app with 60 sleep sounds — rain, ocean, wind — where you can save three favorites for one-tap playback, plus a timer so playback stops on its own. Bluetooth 6.0 handles the connection. Three modes cover the rest of your day: Sleep Mode, ANC Focus Mode for work or study, and Transparency Mode when you need to hear what's around you, switched with a triple tap.
Who should buy it: side sleepers, light sleepers, people sharing a bed with a snorer, shift workers, frequent flyers, and anyone who wants one set of buds for sleep, focus and travel.
Who should skip it: swimmers and heavy sweaters. There's no waterproofing rating in the specs, and these are built for a pillow, not a pool. If you wanted open-ear awareness while running, the sealed in-ear fit is the opposite of what you want.
• Best for swimming → ELYXFUL Bone Conduction Swimming. IP68 plus a 64GB MP3 player is a combination almost nothing else in this category offers.
• Best for sleep and side sleeping → Kinglucky Sleep Earbuds. The 3g weight and silicone contact surface are designed around pillow contact.
• Best for blocking noise → Kinglucky Sleep Earbuds. 50dB hybrid ANC versus zero noise control on the ELYXFUL.
• Best for staying aware of your surroundings → ELYXFUL Bone Conduction Swimming. Open-ear bone conduction keeps your ears free, which matters on a bike or a road run.
• Best battery flexibility → Kinglucky Sleep Earbuds. 7–10 hours per charge and 50 hours total with the case, versus 8 hours on a single ELYXFUL charge.
• Best for phone-free workouts → ELYXFUL Bone Conduction Swimming. Internal storage means no phone, no Bluetooth dropout, no locker anxiety.
• Best for calls and streaming on land → a tie with different strengths. ELYXFUL has Bluetooth 5.3 and a built-in mic; Kinglucky has Bluetooth 6.0 and three listening modes.
• Best for travel → Kinglucky Sleep Earbuds. ANC plus a charging case is the classic flight setup; the ELYXFUL is the better pick only if your trip involves water.
If I had to pick one, I'd buy the ELYXFUL Bone Conduction Swimming — but only because its job is harder to replace. Plenty of earbuds can cancel noise; very few can play 64GB of music from inside a swimming pool with no phone involved. The Kinglucky i99 is genuinely well thought out for sleepers, and if silence is your problem, it's the one I'd hand you. Match the product to the problem, not the other way around.
It's rated IP68, which is built for full submersion — lap swimming, open water, and workouts. The included waterproof silicone earplugs are there to improve underwater audio, so use them.
No. Nothing in the specs indicates a waterproof rating, and the design is aimed at side sleepers and noise blocking. Keep them dry.
The specs list 50dB peak hybrid cancellation combining silicone tips, AI frequency splitting and ANC, plus a Sleep Mode that cuts notifications. That's a serious amount of reduction, though no earbud eliminates every sound.
Both sit in very different categories, so value depends on your use case rather than a single number. Check the current price on Amazon for each before deciding — and weigh it against which problem you actually need solved.
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.