Raised four key design, easy to operate The special shell material, no screen design and simplified key control are also to facilitate the simple control of water. It is not only durable but also beautiful, so that you can highlight different styles. Power on/off/pause: Short press the POWER/PLAY/PAUSE button to turn on, the play indicator is on; short press the PLAY button to enter the pause/play cycle switch in the playing state, Press and hold POWER/PLAY/PAUSE for 1.5 seconds to shut down, and the play indicator will go out; Forward/backward: Short press the PGUP or PGDN button to forward or reverse the song preview and choose to play Main control: Actions 3315D, memory: Micrometre Support audio formats: MP3, WMA Signal-to-noise ratio: 85dB Working temperature: 0-50 degrees Celsius Waterproof level: IPX68 Power supply: built-in polymer rechargeable battery, battery specification; 041235, battery capacity, 120 mA Bare metal weight: 16g Colour:black Material:ABS+pvc Size:64 x 26 x 12mm Package Contents: 1 * Waterproof earphone 1 * 3.5USB adapter cable 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.