Description Charging for three: 12v/24v 3 USB ports offer high-speed charging for driver and passenger. Battery voltage monitoring function, let you always keep battery state of health, prolong the service life of the battery Intelligent shunt voltage and voltage detection,ensure the security of the cellphone/ipad/iphone device charging Cool blue screen LED Display helps locate ports in the dark without being distracting and show clear with the voltage Fashion and Compact Design: Aluminum Alloy and Piano Paint Process. One of the industry’s smallest twin-port USB car chargers. Product Features Size : 2.7 inches x 1.5 inches Weight: 0.8 ounces Input Voltage: DC 12-24V Total Power: 36W Display the voltage of Car Battery Display the charging current while charging Smart IC to detect your devices and input correct charging current.