1、LED display shows the battery input voltage, output voltage. Car power cable can provides power for device easily. If the out put power is higher than 200W, please using the clips to a battery. 2、Dual USB ports, quick recharging for mobilephones, computers, laptop, emergency equipment etc, can be as a emergency power. 3、Built in fuses, safe recharging design and cooling fan prevents the car power converter from over heat, saving power and energy. 4、Over voltage, overload, over current, short circuiting, under voltage, overheating, short circuit guard. 5、Lightweight and compact, ideal for vacations, camping and work trips. It can be plugged into almost 12Volt power output vehicle, providing recharging opportunities anywhere. Specifications: Input voltage: DC10.5V~15V (When the battery voltage is lower than 10.5V, the inverter is low voltage protections, when the battery voltage is higher than 15V, the inverter high voltage protections) Output frequency: 50Hz/60Hz Peaks power: 4000W Rated power: 300W Output waveform: modified sinewave Car use cable length: 425mm / 16.7in Battery clip length: 468mm / 18.4in Item size: 163 * 100 * 77mm / 6.4 * 3.9 * 3.0in Item weight: 400g / 0.9lb Package size: 200 * 130 * 110mm / 7.9 * 5.1 * 4.3in Package weight: 500g / 1.1lb 1 * Inverters 2 * Battery Clip 1 * Car use Power Cable 1 * User Manual