Spesifications : - Working Voltage: 3.7V Lithium Battery 600MA or 5V USB Power Supply - Chip: GPD2846A - Chip Footprint: SOP16 - With 2W Mixed mono - With Power supply ,it can play Automaticly - With LED indicator - Supports MP3 format playback - Supports USB audio mode - Supports 3 types FM radio chip : RDA5807, BK1080 and RTC6207E. - Does not support infrared remote control - Does not support USB device mode