We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-05 · 7 min read · Independent comparison
If you want one pair of open-ear headphones that survives the pool, the rain and the bike lane, choose Opinta Swimming Headphones; if you need eyewear that records your ride while playing music through its arms, choose Generic Sunglasses Camera HD. That is the short version, and it holds up even when you are shopping for children who swim, cycle and generally refuse to sit still.
• Opinta Swimming Headphones — biggest strength: IPX8 water resistance plus 32GB of built-in memory, so music keeps playing underwater in MP3 mode with no phone nearby.
• Opinta Swimming Headphones — biggest trade-off: bone conduction sound is open by design, so it will never give you the sealed, thumping bass of in-ear buds.
• Generic Sunglasses Camera HD — biggest strength: it records HD 1080p video at an 85-degree viewing angle while doubling as Bluetooth sunglasses with earphones.
• Generic Sunglasses Camera HD — biggest trade-off: it is explicitly not water resistant, runs about 2 hours per charge, and needs a micro SD card you supply yourself.
• Pick Opinta if the priority is music that survives water, sweat and long outdoor sessions — including for children.
• Pick the sunglasses camera if the priority is capturing footage hands-free on the bike, and music is a bonus rather than the point.
The Opinta pair is built around one idea: keep the music going when your ears are wet. The IPX8 rating is the headline here — it is the kind of water protection that laughs off sweat, rain and full submersion, which is why the brand tells you to pair them with a swim cap and goggles and switch to MP3 mode once you go under. Bluetooth does not travel through water, so the 32GB of internal memory is not a gimmick; it is the whole reason the product works in a pool. That memory holds roughly 8,000 tracks across MP3, WAV, WMA, M4A and FLAC, which means a child can head to swim practice with a whole season of songs and no phone to lose or soak.
The second thing to understand is the fit. These are open-ear bone conduction headphones, so the driver sits outside the ear canal and sends sound through the cheekbone instead. For children especially, that is a genuinely useful safety feature: they still hear the pool whistle, a parent calling, or a car approaching on the ride home. The frame is plastic with polycarbonate lens material on the earpieces, the whole thing weighs about 0.11 kg, and the open-ear shape is designed to sit alongside a cap and goggles rather than fight them. Bluetooth 6.0 holds a connection out to about 10 meters, and the built-in microphone keeps calls and voice-assistant requests clear when they are out of the water.
Battery is the part that matters for real life. Two hours to charge, up to 8 hours of playback, and a 110-hour standby figure — that is enough for a full day of activities with charging left over, and the magnetic charging connection means nobody is jamming a plug into a wet housing. The honest trade-off is sound character. Bone conduction drivers are tuned to be audible and clear, not chest-thumping, and the frequency range starts at 200 Hz, so deep bass is simply not what this design chases.
Who should buy it: swimmers, cyclists, runners and parents shopping bone conduction headphones for children who need music that survives water and keeps ears open to the world. Who should skip it: anyone who wants isolating, bass-heavy sound in a quiet room, or who needs noise cancellation — this model has none.
This one is a different animal entirely. It is a pair of sport sunglasses first and a gadget second, with a camera tucked into the frame that shoots HD 1080p at an 85-degree viewing angle. The design brief is clear: shield your eyes from the sun while you drive or ride, and quietly record what you see. The loop recording function handles the housekeeping for you — when the card fills up, older clips are overwritten so you are always holding the most recent footage, which is exactly how you want a bike-mounted camera to behave on a long ride.
The Bluetooth side (it pairs under the name MS21) lets you listen to music through the built-in earphones while you wear them, so on a cycling commute you get sunglasses, audio and a camera in one object instead of three. It weighs about 30 grams, runs on a rechargeable battery with roughly 2 hours of life, and supports AAC audio. The lens is a wide-angle, fixed-focus type with a CMOS sensor, and it uses micro SD flash memory at C10 speed class — up to 128GB, but the card is not included, and the brand specifically asks you to format it before first use.
Now the limits, and they are real. The water resistance level is listed as not water resistant. That single line rules it out for swimming, heavy rain, or anything where a splash is likely — which is a sharp contrast with the Opinta pair. Two hours of battery is fine for a commute or a short ride, not for an all-day outing, and the A batteries are included but the device charges as a unit. There is also no mention of any noise control, so treat the earphones as a simple listening feature rather than a serious audio product.
Who should buy it: cyclists, drivers and outdoor hobbyists who want point-of-view video without mounting a camera to a helmet, plus casual music while they move. Who should skip it: swimmers, kids who will dunk them, and anyone who wants the audio to be the main event.
Side-by-Side: Which Should You Choose?
• Best for phone-free music → Opinta Swimming Headphones. The 32GB card and MP3 mode mean no device required.
• Best for video capture → Generic Sunglasses Camera HD. 1080p, 85-degree viewing angle, loop recording.
• Best for battery life → Opinta Swimming Headphones. Up to 8 hours of playback and 110 hours standby against about 2 hours.
• Best for cycling earbuds that stay aware → Opinta Swimming Headphones. Open-ear bone conduction keeps traffic audible, and Bluetooth 6.0 holds a stable 10-meter link in crowded places.
• Best for sunglasses-plus-audio in one → Generic Sunglasses Camera HD. Sun protection and earphones in the same frame.
• Best for children → Opinta Swimming Headphones. Open-ear safety, no phone to carry, and a build that tolerates sweat and pool water.
• Best for simplicity → Generic Sunglasses Camera HD, provided you are comfortable supplying and formatting your own micro SD card.
I would buy the Opinta Swimming Headphones. In my opinion, the IPX8 rating and the 32GB of built-in memory make it the more useful object day to day — it works in the pool, on the bike and in the rain, and it does not ask a child to carry a phone. The sunglasses camera is genuinely clever for recording a ride, but "not water resistant" and about 2 hours of battery put it in a much narrower lane. If you are choosing bone conduction headphones for children, the Opinta pair is the safer and more versatile pick. Check the current price on Amazon before you decide, then match the product to the job.
The open-ear design leaves the ear canal uncovered, so ambient sound like traffic and voices still comes through. That is the main reason parents look at bone conduction headphones for children in the first place. Fit and volume are still your call as the adult.
Do the Opinta headphones work underwater, or only near water?
Both, with a caveat. The IPX8 rating covers submersion, but Bluetooth cannot transmit through water, so you must switch to MP3 mode and rely on the 32GB of stored music while you are actually swimming.
No. Its water resistance level is listed as not water resistant, so keep it dry. It is aimed at cycling, driving and other dry outdoor activities.
No. The micro SD card is not included — you supply one up to 128GB at C10 speed class, and the brand recommends formatting it before use. That is an extra step worth planning for.
They do different jobs, so value depends on your priority: water-resistant, phone-free music on one side, or HD video recording with Bluetooth audio on the other. Check the current price on Amazon for both and weigh it against the feature you will actually use most.
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: Callez Headset vs WAVEFUN Neckband: APTX HD Earbuds, VersionTECH Gaming Earbuds vs HyperX Cloud Earbuds III, Turtle Beach Recon Chat vs KVIDIO Headphones, APETOO USB C Headphones vs Hulaed Invisible Sleep Headphones