Description: -Waterproof MP3 player & earphone designed for swimming, spa and water sports. -High durability aluminum casing with anti-scratch. Compliant with international IPX8 water resistance standard. -Included strap allows you to clip this lightweight device to your swimming goggles, or sunglasses. -Support USB 2.0 full speed data transmission; FM Radio Function. -Built-in lithium battery, capacity of 120mA for playing 6-8 hours. USB Plug & Play, for Windows/MAC OS, no driver is needed. Specification: Type: Swimmer MP3 player Memory: 4GB Interface: 3.5mm Jack Function: MP3 Player, FM Radio Audio Format Support: WMA,MP3 Button ControlsForward, Back, Play/Pause Output of Earphones: 2x4mW Signal Noise Ratio: 85dB Bit Rate: 32-320Kbps Frequency Response: 30Hz to 20KHz Battery Specification: 120mA Lithium Battery Battery Life: 6-8 hours Charging Time: 1.5-3 hours Water Resistance: International standard IPX8 WIFI: No External Memory: No Recording Function: No EBook Reading: No Have Speakers or not: No Temperature Rating: 0-50 Celsius OS Supported: for Windows/MAC OS Body Material: Aluminum Product Size: 63x21x21mm/2.5x0.83x0.83inch Product Weight: 24g Package Includes: 1 Piece Waterproof MP3 Player 1 Piece Waterproof Earphone 1 Piece Armband 1 Piece USB Cable 1 Piece User Manual Note: You are suggested to adjust the volume of the player to suit yourself before using the FM function since you cannot adjust when using this function.