【Bluetooth 5.4 with MP3 Player】: Muxun Swim One bone conduction headphones transmits excellent sound quality directly through your skull, allowing you to enjoy quality music while protecting your hearing to reduce the burden on your ears, while also allowing you to be aware of your surroundings, making outdoor sports safer. Bluetooth wireless transmission about 33ft away.

【To Switch Between Bluetooth and MP3 mode】: Short press the M button for 2 seconds to switch to MP3 mode and Bluetooth. Note:Use MP3 format when swimming. Bluetooth is not conducive with swimming.

【To Import Audio Files 】: By connecting the data cable to the computer, you can transfer the downloaded songs into the device. To play the songs, switch to the MP3 mode.

【IP68 Waterproof Rating】: With a triple-sealed design, OpenSwim Pro is fully sweatproof and can be submerged in water up to two meters deep for two hours, for built-in MP3 audio play while swimming. included pools, ocean, and fresh water lakes no any issues with water.

【Open-Ear Comfort and Connection 】: Our open ear headphones are designed for enhanced safety and extended listening. Remain engaged with your surroundings while enjoying premium audio, in or out of the water.

【8 Hours of Music & Calls 】: OpenSwim Pro technology delivers up to 8 hours of continuous battery life, plus a 10-minute quick charge to immediately prepare for up to 3 hours of listening time.

【Secure and Stable Fit 】: Engineered for a slim, lightweight, ergonomic fit that stays comfortably in place through any workout and integrates seamleassly with swim caps and goggles or sunglasses and bike helmets. They are comfortable and easy to use, you can forget they are there. The buttons to press to jump from Bluetooth to MP3, to adjust the volume, etc. are easy to reach and both logical and efficient.