1. High durability shell with clip, more convenient to carry. 2. The IPX8 standard is very suitable for swimming/running/surfing/sports. 3. Equipped with a rechargeable lithium battery, it can work for 8 hours after being fully . 4. You can freely switch between MP3 mode and FM radio. 5. Unique waterproof design, IPX8 waterproof grade, even if you are swimming, you don't have to worry about listening to music. Waterproof grade: IPX8 Underwater depth: 3 meters/9.84 feet Memory expansion: not supported Music format: MP3/WMA/WAV FM frequency modulation: 87MHz-108MHz Battery capacity: 180mah Charging time: approximately 2 hours Playback time: approximately 8 hours Colour:Black Material:Plastic Package Contents: 1x host 1x data cable 1x earphone (random style,can not be chosen the specific .without strap) Only the above package content, other products are not included. Note: Light reflection 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.