Type:Active Use:Computer, Mobile Phone, Portable Audio Player, Stage Channels:3 (2.1) Special Feature:Mini, Portable, Wireless Place of Origin:Guangdong, China (Mainland) Speaker diameter:40mm HiFi speaker Frequency Response:160HZ-20KHZ Power input:DC 5V/500mA Version:RDA 2.1 EDR Battery voltage:5V Charging time:2 hours Net Weight:0.5 lb Playing Time:>3 hours