usb pass through 1.CE,FCC,ROHS 2.USB Port 3.4 Voltage adjustable 4.Easy carry 2012 newest best selling Variable Voltage 3.2 ... ~4.8V usb pass through Specifications:1.Model: VV Pass through Battery2.Style ... .6V/4.2V/4.8V, and Various Voltage, from 3.0V to 4.8V, light color from Blue to Green.4.Come with USB Cable ...