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.)