... % full-load burning test 3.Safety & heat reduction Specification of usb adapter:Input Voltage:12~24VOutput Voltage:3.3V~12VOutput Current: 0 ... /cartonSuggested application: Ipod,Iphone,Zen,Zume,MP4 ,etcDetailed picture of usb adapter: 5v 500mA ~ 1000mA usb adapter for car radio