Bone Conduction Headphones IPX8 Water Proof 32G Wireless Bluetooth Sport Headphones Item Type: Bone Conduction Headphones Material: ABS Memory: 32GB Working Frequency: ISM Band (2.402-2.480GHz) Battery: Built In 300mAh Li Battery Compatible Sound: MP3, WMA, FLAC, APE Features: Water Proof, Bone Conduction, Long Battery Life, No Hands Calling Bluetooth Protocol: 5.0 Use: Headband Single or Both Ears: Double Sided Stereo Color: Black Charging Time: 3 Hours Playback Time: 6-12 Hours Style: Sporty Water Proof Rating: IPX8 Data Transfer: Connect the earphones to a computer via data cable, the computer will automatically recognize it as a removable disk for music transfer or deletion. Troubleshooting: 1. The machine has temperature control guard, it will automatically disconnect and shut down when charging or used in high-temperature environment, please wait for temperature to return to normal before restarting manually 2. If the device is unresponsive or cannot be powered on/off, perform a forced reset by holding the power key for 20 seconds 3. If the device powers on but only in Bluetooth mode, charge for half an hour, then connect to a computer to check for incompatible sound files 4. If charging or data connection indicator lights are off or not reading, check for dirt in the charging port, clean it and try again without using extension cords, use the original data cable and port or try a different port 5. If Bluetooth connection fails, turn off and reboot the phone's Bluetooth before reconnecting Weight: Approx. 149.00g / 5.26oz