headset sports wireless mp3 player 1.Without screen 2.Support TF card 3.Built-in polymer Lithium battery Hot sale headset sports wireless mp3 player with Hifi sound Detailed description Headset MP3 with Hifi sound effect Card reader MP3 (supports many audio formats, such as MP3, WMA, WMV and WAV); With built-in polymer Lithium battery Accessory: Blister packing,usb cable,user manual System ...