Bluetooth-compatible version: 5.0 Battery capacity: 180Mah Transmission distance: 10M Material: ABS Function: 1. long press - to decrease the volume Short press - next song 2. press and hold the middle key to start the machine Short press the middle key to pause / hang up / answer Double click the middle key to call back the last time 3. long press the + sign to increase the volumeShort press the + sign to the previous song 4 micro charging port Specifications: Ergonomic designSpecial Bone Conduction Design Volume adjustableWith Volume Control Button, Answer/Pause/Play Button Skin friendly materialTPE Material, Skin-friendly, Non-irritating Lightweight and protableLightweight, Zero Burden, Unrestrained Safety:Don't go into your ears, listen to external voices at any time, don't plug your ears when traveling, say goodbye to blockage and reduce the burden on your ears Package Included: 1*headphone 1*charing cable