... efficiently in approximately 3 hours without orvercharging your batteryProduct features1.Car charger, Compatible with iPhone 4 ,iphone3G ,iphone , ... your cellphone in holder steadily Key wordsFor iPad/iPhone Car Charger 1A and 1AaaInput voltageDC12-24VoutputDC 5V/1000mah--2000mahefficiency ... ≥ 80%working temperature<60 ° Weight35g For iPad Car Charger 5V 1A and 2.1A Hot sale Good Quality