GPX HW-6805DT 128MB MP3/WMA Headphones with FM Tuner 128MB internal memory provides 2 hours of playback in MP3 format, or 4 hours of playback in WMA format Ultra-light, comfortable backstrap-style headphones Plug-and-play with 5 preset EQ, transflash expandable 5 1/5" W x 5 1/2" H x 1" D Includes rechargeable Li-Ion battery