abcGOODefg USB Sport Wireless Handsfree Earphone Headset Headphone MP3 Player Black (Green) USB 2.0 Sport MP3 Player General Features: Color: Black Supports up to 4 GB storage Comfortable behind-the-head stereo headphones with built-in controls and LED indicator Built-in Lithium-polymer battery Supports MP3, WAV and WMA formats USB 2.0 high-speed interface Specifications: Lithium-Ion Battery Audio Formats: MP3/WMA/WAV S/N Ratio: 86dB Output Frequency: 20Hz - 20 kHz Package include : (1)1x Headset MP3 Player (2)1x Mini USB to USB cable