If you want a flexible open-ear fit with a shorter charging time, choose RELAXYO Bone Conduction Swimming; if you need longer stated playback, more listed audio formats, and touch controls, choose Opinta Swimming Headphones. For kids who will use headphones both at the pool and on dry land, the key difference is how each handles stored music and everyday controls—not Bluetooth underwater.
Both use bone conduction and offer 32GB of music storage, so each can play music while swimming in MP3 mode. RELAXYO lists a flexible memory-titanium frame and a 1.5-hour charge; Opinta lists up to eight hours of continuous playback and support for five named audio formats. Neither is an ordinary pair of headband headphones for kids, and neither streams Bluetooth beneath the water.
• RELAXYO’s strength: flexible memory-titanium frame, 32GB storage, and a listed 1.5-hour charge. Trade-off: up to seven hours of music playback, one hour less than Opinta’s stated maximum.
• Opinta’s strength: up to eight hours of continuous playback, 32GB memory, and support for MP3, WAV, WMA, M4A, and FLAC. Trade-off: its listed charging time is two hours, and the sheet describes its controls as touch controls rather than giving a button-by-button layout.
• For pool sessions: either can play stored music in MP3 mode; Bluetooth does not transmit underwater on either model.
• For dry-land listening: both list Bluetooth and a 10-meter range. Opinta specifies Bluetooth 6.0; RELAXYO specifies Bluetooth 5.4.
• Choose RELAXYO if you want the flexible frame and shorter stated charging time; choose Opinta if longer listed playback and the named file-format support matter more.
• For kids: RELAXYO is the fit to consider for its flexible frame and simple three-button operation; Opinta suits families who prioritize its longer playback figure and format options.
RELAXYO combines an open-ear bone-conduction design with a flexible memory-titanium frame. The frame is described as able to bend, and the headphones are designed to sit around the ear without putting pressure directly inside it. That makes the design worth considering for a child who dislikes in-ear earbuds or for a swimmer who wants an open-ear fit that can be worn with a swim cap or goggles. The product information identifies the intended age range as adult, though, so parents should take that into account rather than assume it is sized specifically for kids.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-19 · 8 min read · Independent comparison
Its 32GB of built-in storage is intended for music files transferred from a computer using the included magnetic charging cable. The listed capacity is up to 7,000 songs, though the number a person can store depends on the files. For swimming, the important step is switching from Bluetooth to MP3 mode: the product sheet says Bluetooth cannot transmit underwater. Out of the pool, Bluetooth 5.4 is listed with a range of more than ten meters in barrier-free conditions, and the controls include three buttons for power, playback, calls, volume, and mode changes.
The trade-off is straightforward. RELAXYO lists up to seven hours of music playback and a 1.5-hour charging time, so its charge is quicker on paper, but its stated continuous listening time is shorter than Opinta’s. Its open-ear construction also has no noise control listed; it is not presented as a way to block the sounds around a swimmer. Who should skip it: skip RELAXYO if your priority is the longest stated playback time or a product specifically identified for children.
Opinta is another open-ear bone-conduction option designed for pool use and dry-land exercise. Its IPX8 water-resistance specification is paired with instructions to use MP3 mode underwater, and the design is described as compatible with a swimming cap and goggles. The open-ear approach leaves the ear canal uncovered, which some families may prefer over conventional earbuds. The product information, however, also lists the age range as adult, so it should not be treated as a child-sized model based on the available details.
The strongest practical case for Opinta is its stated playback and file support. It lists up to eight hours of continuous music, a two-hour charging time, and a 32GB memory card that can hold up to 8,000 tracks according to the product sheet. It names MP3, WAV, WMA, M4A, and FLAC as supported formats. That gives a buyer more explicit information about the types of stored audio files it can play. As with RELAXYO, swimming requires stored music in MP3 mode because Bluetooth signals cannot travel underwater.
For dry-land use, Opinta specifies Bluetooth 6.0, a 10-meter range, a built-in microphone, and touch controls. The sheet says the microphone can be used for calls and voice-assistant instructions, but does not describe the touch gestures or their layout. Its trade-off is a two-hour listed charge and a less detailed description of how the headphones fit and adjust compared with RELAXYO’s flexible frame. Who should skip it: skip Opinta if a clearly described flexible frame or physical three-button controls are your main priorities.
• Best for shorter stated charging time → RELAXYO Bone Conduction Swimming. Its listed charge is 1.5 hours, compared with two hours for Opinta.
• Best for longer stated continuous playback → Opinta Swimming Headphones. Opinta lists up to eight hours; RELAXYO lists up to seven.
• Best for a specifically described flexible frame → RELAXYO. Its memory-titanium frame is described as bendable and shaped to follow the ear.
• Best for named audio-file support → Opinta. Its sheet names MP3, WAV, WMA, M4A, and FLAC; RELAXYO describes transferring music files but does not list the same range of formats.
• Best for simple physical controls → RELAXYO. It has three buttons with described functions; Opinta lists touch controls without detailing gestures.
• Best for the newer listed Bluetooth version → Opinta. It specifies Bluetooth 6.0, while RELAXYO specifies Bluetooth 5.4. Both list a 10-meter range, and neither supports Bluetooth transmission underwater.
• Best for a large stored music collection → a close call. Both have 32GB of storage. RELAXYO lists up to 7,000 songs, while Opinta lists up to 8,000 tracks; those figures are estimates, not a guarantee of an identical library size.
• Best for a child who needs an open-ear alternative to a bluetooth earbuds gift for kids → consider either, with supervision and fit in mind. Both are listed for adults, so the available specifications do not establish a child-specific fit.
Start with how the headphones will actually be used. In a pool, neither product can stream music from a phone over Bluetooth. The swimmer needs music stored on the headphones and must select MP3 mode. That means a family should be comfortable transferring audio files to the device before a swim, rather than expecting a phone to provide a live connection in the water.
Next, consider fit and controls. RELAXYO provides more detail about its frame and button operation, which may help a parent understand what the child will need to wear and operate. Opinta gives a longer playback figure and names several supported formats, but the supplied information does not explain its touch gestures. For either product, the adult-age-range description means fit for a particular child should not be assumed from the specifications alone.
Neither set of details describes noise cancellation or other noise control. Their open-ear design is a meaningful difference from closed or cushioned headphones, but it is not the same as isolating the listener from surrounding sound. If you are looking for memory foam ear cushions head phones for kids, neither sheet lists memory-foam cushions: both products are described as open-ear bone-conduction headphones.
Finally, think about who will manage charging and music. RELAXYO’s shorter listed charging time may be convenient between activities, while Opinta’s longer stated playback may reduce how often it needs a charge. Those are specification-based differences, not guarantees of real-world battery performance. If you are also comparing the overall value, check the current price on Amazon before deciding; the product details alone do not establish which one offers better value for your household.
My Verdict
No. Both product sheets state that Bluetooth cannot transmit underwater. For swimming, use stored music and switch the headphones to MP3 mode.
Opinta lists up to eight hours of continuous music playback, while RELAXYO lists up to seven hours. Actual listening time can vary, and both figures are stated maximums.
Both products use an open-ear design, but each product’s information describes its age range as adult. The available details do not confirm a child-specific fit, so check fit carefully before choosing one for a child.
Both offer 32GB of storage. Opinta specifically lists support for MP3, WAV, WMA, M4A, and FLAC; RELAXYO describes transferring music files from a computer but does not provide the same format list.
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