Festures:1. High quality， great-sounding lets you enjoy your sports and music at the same time2. Support MP3/WMA format3. Support FM radio4. Built-in fash memory up to 16GB5. Powered by USB cable， use mini USB 5V charger to recharge it for 2~3 hours6. Can play about 8 hours7. With built-in rechargeable polymer Lithium battery offers high safety and stability and avoid over-charge and over-discharge8. Comfortable and secure for most users: bicyclist， runners， joggers， walkers etcSpecifications:1. Output Frequency: 20Hz-20kHz2. Working Temperature: -10~45 Celsius3. Operating system: for Windows 98/2000/XP/ for WIN 74. Size: App.15.5cm x 12cm/6.10''x4.72''5. Cable Length: App.51cm/20.0''6. Color: Black/Blue/White/ for Pink/GreenHow to Use:1. Switch the power button to "on"， and then the LED turns on， press the function button (MODE)， the default status radio is enabled and the earphone works2. MP3 Playback: Insert TF card in proper direction and the product automatically switch to MP3 playback mode. Press previous/next to perform the corresponding operations.3. Pause Playback: Press button >|| 4. Volume Control: Long press the Previous/Next button to volume up or down5. Power Off: Push the switch to "OFF"Note: It ONLY supports play music from TF card or FM radio. TF card NOT included. Package Included:1 x Sport Headphone1 x USB Charging cable