This is a stylish, great-sounding sport headphone, lets you enjoy your sports and music at the same time! Support TF and FM radio, if POWER ON without inserting TF card in the headphone, the default mode is FM radio, on the contrary, the default mode is MP3 player if insert TF card in it before POWER ON. Festures: 1. High quality, great-sounding lets you enjoy your sports and music at the same time 2. Support MP3/WMA format 3. Support FM radio 4. Built-in fash memory up to 16GB 5. Powered by USB cable, use mini USB 5V charger to recharge it for 2~3 hours 6. Can play about 8 hours 7. With built-in rechargeable polymer Lithium battery offers high safety and stability and avoid over-charge and over-discharge 8. Comfortable and secure for most users: bicyclist, runners, joggers, walkers etc Specifications: 1. Output Frequency: 20Hz-20kHz 2. Working Temperature: -10~45 Celsius 3. Operating system: Windows 98/2000/XP/WIN 7 4. Size: App.15.5cm x 12cm/6.10''x4.72'' 5. Cable Length: App.51cm/20.0'' 6. Color: Black/Blue/White/Pink/Green How 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 works 2. 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 down 5. 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 Headphone 1 x USB Charging cable