If you want a feature-rich in-ear headset for everyday listening, calls, and workouts for kids, choose GravaStar Sirius Plus True; if you need open-ear bone conduction headphones built for swimming, choose POPUX Bone Conduction Headphones.
The deciding difference is the listening design: GravaStar seals into the ear and adds active noise cancellation, while POPUX leaves the ears open and is specified for underwater use. For a kids headset gift for kids, match the choice to where it will actually be worn.
If you want a feature-rich in-ear headset for everyday listening, calls, and workouts for kids, choose GravaStar Sirius Plus True; if you need open-ear bone conduction headphones built for swimming, choose POPUX Bone Conduction Headphones.
The deciding difference is the listening design: GravaStar sits in the ears and adds active noise cancellation, while POPUX leaves the ears open and is specified for underwater use. For a kids headset gift for kids, match the choice to where it will actually be worn.
• GravaStar Sirius Plus True: In-ear design with active noise cancellation, app-based sound customization, and up to 28 hours of combined playtime; trade-off: it is not specified for swimming.
• POPUX Bone Conduction Headphones: Open-ear bone conduction design, IP68 waterproofing, and built-in 32GB MP3 storage; trade-off: its playback time is shorter in MP3 mode than its Bluetooth mode.
• GravaStar suits everyday listening, calls, and workouts where an in-ear fit and noise control are useful.
• POPUX suits swimming and active use where an open-ear design and phone-free MP3 playback matter.
• For kids: choose based on whether the main setting is ordinary listening and light exercise or swimming and water-based activity.
GravaStar is the more conventional everyday earbud option here. Its in-ear design, 10mm dynamic drivers, Bluetooth 5.3, and active noise cancellation point toward music, videos, calls, and other listening away from the pool. The product information also describes a transparency mode for situations when the wearer wants more awareness of surrounding sounds. That mix gives it more ways to adjust the listening experience than a simple pair of basic wireless earbuds.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-23 · 6 min read · Independent comparison
Its battery setup is straightforward: up to seven hours from the earbuds, with another 21 hours available from the case, for up to 28 hours combined. The stated full charging time is 1.5 hours. An app allows EQ and control customization, while ENC is intended to reduce background noise during calls. IPX4 protection is specified for sweat and light rain, making these a plausible fit for workouts or an active school day—but not a substitute for headphones designed for swimming.
I’d consider GravaStar for someone who wants one set of in-ear headphones for everyday listening, calls, and occasional exercise, and who would enjoy adjustable sound and distinctive styling. Its aluminum-alloy construction and six-color gradient lighting give it a noticeably more decorative look than a plain pair of earbuds. I’d skip it for a child who needs headphones specifically for the pool, or if an open-ear fit is the priority. The available specifications don’t establish that its fit will suit every child, so comfort should not be assumed from the adult-oriented feature list.
POPUX takes a different approach: it is an open-ear bone conduction headset designed with swimming in mind. Its IP68 waterproof rating is the key distinction in this comparison. The flexible titanium-alloy frame and adjustable strap are intended to help it stay in place through activities such as running, gym workouts, hiking, and swimming. At 25 grams, its listed weight is light, though fit will still depend on the wearer.
The 32GB of built-in storage provides an MP3 mode for listening without a phone. That is useful to consider for swimming, where relying on a phone’s Bluetooth connection may not suit the activity. POPUX also supports Bluetooth 5.4 and multipoint connection, according to its feature information. Battery life is stated as up to 10 hours in Bluetooth mode and six hours in MP3 mode; a ten-minute charge is described as providing two hours of wireless playback.
I’d choose POPUX for a swimmer or active listener who specifically wants open-ear bone conduction headphones for kids’ water-based activities. Physical buttons may also be practical when touch controls are awkward, such as during exercise or with wet hands. The trade-off is that this is a more specialized option: it does not offer GravaStar’s listed ANC or app-based EQ customization, and its two playback modes have different stated runtimes. If the main need is everyday in-ear listening rather than swimming, GravaStar is the more natural match.
• Best for swimming → POPUX Bone Conduction Headphones. Its IP68 waterproof rating and built-in MP3 storage make it the clearly water-focused design.
• Best for everyday in-ear listening → GravaStar Sirius Plus True. It combines in-ear placement, active noise cancellation, and app-based EQ adjustment.
• Best for phone-free music during a swim → POPUX. Its 32GB of storage supports MP3 playback without depending on a phone connection.
• Best for longer combined listening with a charging case → GravaStar. Its stated total is up to 28 hours, including 21 additional hours from the case.
• Best for adjustable sound and controls → GravaStar. The app supports EQ and key-function customization.
• Best for quick stated charging → POPUX. Its feature information says a ten-minute charge can provide two hours of wireless playback; GravaStar lists a 1.5-hour full charge.
• Best for sweat and light rain during workouts → GravaStar. It has an IPX4 rating; choose POPUX instead when the use case calls for its specified swimming protection.
• Best for handling controls during activity → POPUX. Its physical buttons are designed for direct operation while moving or with wet hands.
In my opinion, I’d buy the POPUX Bone Conduction Headphones for a child whose main need is swimming or other water-based activity. The IP68 rating and built-in MP3 storage address that use case more directly than GravaStar’s sweat-and-light-rain protection. For a kids headset gift for kids who mostly listen outside the pool, I’d choose GravaStar instead for its ANC, app customization, and longer stated combined battery life.
FAQ
Are POPUX bone conduction headphones suitable for swimming?
Which headphones last longer on a charge?
GravaStar lists up to seven hours from the earbuds and up to 28 hours when the case’s additional 21 hours are included. POPUX lists up to 10 hours in Bluetooth mode and six hours in MP3 mode, so compare the relevant listening mode rather than treating those figures as directly interchangeable.
GravaStar lists hybrid active noise cancellation for listening and ENC noise reduction for calls. POPUX lists a noise-cancelling microphone, but its open-ear bone conduction design does not list ANC or app-based EQ controls.
Start with the activity: POPUX is the water-focused option, while GravaStar is an in-ear choice for everyday listening, calls, and workouts with sweat or light rain. The specifications do not confirm a child-specific fit for either model, so consider the intended wearer’s comfort and fit needs before deciding.
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