FAST DUAL USB CHARGING PORTS - Combined 3.1 amps; 15W; uses smart technology to ensure each device pulls the right amperage. Dual USB car charger is powered by the vehicle's cigarette lighter.</br>OVER-CHARGE PROTECTION - The mini USB car charger is auto power off when input/output is greater than safety current protects against over-heat over-current and over-charging</br>LED DISPLAY - LED digital luminescence tubes; Display cycles between internal temperature (Fahrenheit) device's charging current and the voltage of the vehicle's car battery. (Note: When using the device to charge it display the charger's temperature instead of the internal temperature of your car. ) The LEDs are bright enough to read the display without being a distraction while driving. New updated version (ASIN B01N00I4TM) with LED Voltage & Amps Display only.</br>SPECIFICATIONS - Input: DC 12V - 24V Output: DC 5V/3.1A 15 W Conversion efficiency 95% Measuring range: Voltage 5V-25V Current 0 - 3.1A Temperature -4p to 176p F</br>PACKAGE INCLUDES: 1 x Jebsens 4in1 Dual USB Car Charger with LED Display. (Charging Cable NOT included) 1 Year Guarantee provided by Manufacturer. Money Back Guarantee from JebsensDirect. Need a Car Mount? Check out the No.1 Rated JEBSENS CA02 Magnetic Air Vent Car Mount (ASIN: B0144AX6WK) - Enjoy hands free driving!</br></br>Product Description</br></br>All car owners should know that electric appliances?? such as power switch?? spark plugs?? and other internal electronics can be gradually damaged if the voltage is too high (exceeding normal value by 15%). Similarly?? cars will not work proplerly if subject to under-voltage