... different shapes, different sizes,single or double USB port and easy to carry dual usb2.0 Car Charger for iphone & ipad ParametersImput: ... voltage: 5VDC 3100MAMax. continuous power: 12 WattsPeak Power: 18WattsDouble USB port for cableVoltage constant circuit protectionLED indicates the charger working ... -charging,over-load,Short-circuit,Auto-recovery function dual usb2.0 Car Charger for iphone & ipad