Vehicle Jumpstart: To start a dead or weak car battery in emergencies. Air Compressor: Features a built-in compressor with a pressure gauge (left dial) for inflating tires or balls. 400W Inverter: Converts internal battery power to run devices that use 110V AC power. Various Power Ports: 12V DC output for powering car accessories, plus a USB port for charging smartphones and tablets. Built-in LED Worklight: A light on the front for use at night or during breakdowns. Battery Status Indicator: The right dial (DC Volts) shows the internal battery charge level of the device to know when it needs recharging.