If you want a versatile, long-lasting wireless companion for running and gym sessions with superior battery endurance, choose KOAIEZ IP7; if you need a dedicated underwater tool that stores music directly on the device for pool laps without a phone, choose RELAXYO Bone Conduction Swimming.
• KOAIEZ IP7 delivers exceptional battery life (up to 10 hours continuous use) and a secure neckband fit perfect for high-intensity land sports, though it lacks internal storage for offline playback.
• RELAXYO Bone Conduction Swimming offers true IPX8 waterproofing for submersion and built-in 32GB memory for phone-free listening, but its battery life is shorter at 7 hours and it requires MP3 mode underwater since Bluetooth won't transmit through water.
• Who is this for? The KOAIEZ IP7 fits the active runner or cyclist who wants all-day power, while the RELAXYO model is the clear winner for serious swimmers and triathletes who need to leave their phones behind in the locker room.
The KOAIEZ IP7 is engineered specifically for the athlete who lives outside the pool. Its primary strength lies in its ability to stay powered up for extended periods. With a charging time of just two hours, this headset provides between six to ten hours of continuous playback for music, audiobooks, or podcasts. That range is significant for anyone training for a marathon or spending a full day hiking; you aren't constantly tethered to a wall outlet waiting for a quick top-up. The battery performance here suggests a design philosophy centered on endurance rather than constant connectivity.
Design-wise, this unit leans heavily into comfort and stability for movement. The neckband is wrapped in comfortable rubber that "hugs" the head, ensuring the earbuds loop securely over the tops of your ears. This specific ergonomic approach means you don't have to worry about the device dropping during vigorous arm swings or sudden turns. The skin-friendly silicone construction allows for prolonged wear without pain, making it a solid choice for those who find traditional in-ear headphones for dj or general fitness use too intrusive or heavy.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-29 · 7 min read · Independent comparison
However, there is a distinct trade-off you must accept. While the KOAIEZ IP7 supports Bluetooth 5.3 for strong signal transmission and multi-pairing, it does not include internal storage for music files. You cannot detach from your phone to listen to an audiobook while swimming or doing laps in the pool. If you are looking for headphone for dj setups where portability is key but you always have your phone nearby, this works well. But if you want to run in a park without carrying a device, you will be limited by your phone's proximity. It is also worth noting that while it is IPX7 waterproof, meaning it handles sweat and rain easily, it is not rated for submersion like a swimmer would require.
The RELAXYO Bone Conduction Swimming model is a specialized tool built for one dominant environment: water. Its defining feature is the IPX8 waterproof rating, which explicitly allows for work underwater. This isn't just splash resistance; you can wear this with goggles and a swim cap while fully submerged. For a swimmer, this eliminates the anxiety of a device failing the moment it hits the deep end. The engineering here prioritizes moisture resistance above all else, ensuring that perspiration, rain, or chlorine water do not compromise the electronics.
Perhaps the most critical feature for the independent swimmer is the built-in 32GB MP3 player. Unlike many bone conduction headphones that rely entirely on a paired smartphone, this unit holds roughly 7,000 songs directly on the device. By connecting via a magnetic charging cable to a computer, you can copy your favorite tracks onto the headset itself. This means you can hit the pool deck, drop your phone in a locker, and still enjoy your music playlist. The Bluetooth 5.4 chip is present for land use, offering near-zero latency and stable connections, but the manufacturer correctly notes that Bluetooth cannot transmit underwater. In that scenario, you simply switch to MP3 mode to play the stored files.
The physical design supports this aquatic focus. Weighing only 30 grams, it is incredibly lightweight, which reduces drag and fatigue during long swims. The open-ear design keeps you aware of your surroundings even when out of the water, which is a safety benefit for outdoor runners as well. However, the battery life is capped at seven hours of continuous play. While sufficient for most daily workouts, it is less generous than the KOAIEZ option. Furthermore, the lack of a jack means you are entirely dependent on wireless protocols or the internal storage; there is no wired backup option if the battery dies mid-swim. It is a fantastic piece of gear for the best extra bass kids headphones for dj style enthusiasts who want to avoid in-ear discomfort, but its utility is heavily weighted toward water-based activities.
• Best for battery life → KOAIEZ IP7: With up to 10 hours of playback on a single charge compared to RELAXYO's 7 hours, the KOAIEZ IP7 wins for long training sessions.
• Best for underwater use → RELAXYO Bone Conduction Swimming: Only the RELAXYO model carries an IPX8 rating suitable for submersion and includes the necessary MP3 mode to function without a phone.
• Best for offline listening → RELAXYO Bone Conduction Swimming: The 32GB internal memory allows you to swim without your phone; the KOAIEZ requires a connected device.
• Best for secure fit during intense cardio → KOAIEZ IP7: The rubber-wrapped neckband hugging the head offers a unique stability that prevents slipping during high-impact land sports.
• Best connectivity speed → RELAXYO Bone Conduction Swimming: Bluetooth 5.4 offers improved communication speed and distance over the KOAIEZ's Bluetooth 5.3.
• Best value for versatility → KOAIEZ IP7: If you do a mix of running, cycling, and gym work but rarely swim, the longer battery and lower price point (based on typical market positioning) make it the more practical daily driver.
• Best for swimmers and triathletes → RELAXYO Bone Conduction Swimming: The combination of IPX8 protection and onboard storage makes this the only viable choice for pool training.
• Best for sound clarity on land → KOAIEZ IP7: While both use bone conduction, the KOAIEZ emphasizes clearer mid-range and high frequencies for the outdoor experience.
After weighing the specifications and intended use cases, I would buy the KOAIEZ IP7 for my daily routine. The sheer convenience of having 10 hours of battery life means I never worry about charging it after a morning run or a long gym session. For a general user who needs a reliable headphone for dj setup or personal listening while moving around, the ability to stream from a phone is far more common than the need to store music internally. However, if your primary goal is swimming, the RELAXYO is the undisputed champion because no other device matches its IPX8 rating and standalone music capabilities. Ultimately, the KOAIEZ IP7 offers the best balance of power and comfort for the average active person, while the RELAXYO serves a very specific, vital niche.
While neither is designed for professional studio mixing, the KOAIEZ IP7 offers richer mid-range and high-frequency audio that may suit casual listening or mobile DJing better than the standard options. The open-ear design ensures you remain aware of your environment, which is crucial for live settings.
Yes, the RELAXYO Bone Conduction Swimming features 32GB of built-in memory. You can load songs directly from a computer and use the MP3 mode to listen anywhere, including underwater where Bluetooth does not work.
The KOAIEZ IP7 is IPX7 rated, meaning it handles heavy sweat and rain perfectly but should not be submerged. The RELAXYO is IPX8 rated, making it safe for full underwater immersion, swimming, and diving, which is essential for lap training.
The KOAIEZ IP7 provides up to 10 hours of continuous use on a two-hour charge, whereas the RELAXYO offers 7 hours. If you are planning a full day of hiking or training without access to a charger, the KOAIEZ is the superior choice.
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