New design with double 3.1A USB output‎,‎ PTTC over‎-current protection‎,‎ display the voltage‎,‎ temperature and current alternately by each 10 seconds‎.‎ Auto power off while the input current or output current is greater than the safety current‎,‎ please plug out and try‎,‎ it will work again‎.‎Features‎:‎·Car Charger 4 in 1 Dual 3.1A USB Voltage Current Meter Tester Bullet Adapter For Apple iPhone iPod Smartphones Android Samsung HTC Sony LG·With temperature and current meter tester‎.‎·Fixed support helps stabilize the USB car charger‎.‎·Multifunction product with 10A protection tube‎,‎ perfect for travel use‎.‎·Apply to all USB charging mobile phones or other electronic products‎.‎·This easily installed 5V‎,‎ 2.1A output port holds your smart phone‎,‎ GPS‎,‎ MP3‎.‎·Optimized for iPad‎,‎ iPhone and iPod‎-fast loading at full speed‎.‎‎(‎2.1 amps for iPad‎,‎ 1 amp for iPhone / iPod‎.‎‎)‎Type‎:‎ 4 in 1 Car ChargerCompatible Model‎:‎ UniversalColour‎:‎ BlackLCD Digital Color‎:‎ BlueOutput Interface‎:‎ USBInput voltage‎:‎ DC 12V‎-24V ‎(‎Error of plus or minus 0.2V‎)‎Output voltage‎:‎ DC 5V ‎(‎Error of plus or minus 0.1A‎)‎Output current‎:‎ 3.1AConversion efficiency‎:‎ 95%Voltage measuring range‎:‎ 5V‎-25VCurrent measuring range‎:‎ 0‎-3.1ATemperature didsplay‎:‎ by FahrenheitTemperature measurement range‎:‎ ‎-4℉ to 176℉Size‎:‎ 42mm x 78mm x 20mm/1.65‎"‎ x 3.07‎"‎ x 0.79‎"‎ ‎(‎Approx‎.‎‎)‎