1. Small and delicate to carry around. 2. Mobile phone control: answer the call, hang up the call, play up, down, pause, volume up, volume down. 3. It can be used for car music control, bicycle music control, motorcycle bicycle control, skiing and other outdoor sports. Bluetooth-compatible version: 5.0 Remote distance: 10m Voltage: 5V Power: Built-in rechargeable battery (450mAh) Waterproof grade: IPX4 Product size: about 110x70x20mm/4.33x2.76x0.79 inch Colour:black Material:ABS Package Contents: 1x Bluetooth Controller Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.