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 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 Supports Recording Function: No Supports 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 MP3 Player 1 Piece 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. The data cable must be connected to mp3 first, and then connected to the computer If you can't connect to the computer for the first time, you need to unplug the data cable, press the dot in the middle to reset, then plug the data cable into the mp3, and then connect to the computer.