4in1 3.1A Dual USB Car Charger Adapter Socket With LED Tester VoltmeterDescription:Double 3.1A USB outputOver-current protection4In 1 fuctions:Voltage measuring,Current measuring,Temperature measurement,ChargingCan charge two devices at the same timeCompact design and easy storageWill charge your standard or extended batteryIntelligent IC chip inside recognizes a fully charged batteryAtomatically switches to a saver mode to prevent overcharging and short circuitPlugs into your car's cigarette lighter and charges your phone and other electronic devices while you're drivingCompatible with most phones and devices(iPod,iPad,iPhone,MP3,MP4,camera etc).Specifications:Input voltage: DC 12V-24VOutput voltage: DC 5VOutput current: 3.1AVoltage measuring range: 5V-25VCurrent measuring range: 0-3.1ATemperature measurement range: -20 degrees ~ +80 degreesPackage Included:1 X Dual USB Car Charger