The Bestek 300W Pure Sine Wave Power Inverter (DC 12V to AC 110 V) can fast charge up to 4 devices simultaneously. The unit has 2 AC outlets for devices such as laptops, tablets and other similar devices and 2 USB 4.2A ports for cell phones, tablets, music players and other similar devices. The pure sine inversion technology provides optimum compatibility with sensitive equipment, computers, televisions, cameras and more. The unit’s built in Isolated Voltage Protection helps protect your devices against over-voltage, low-voltage, overload, overheating, over-charging, over-temperature and short circuit. The unit includes a 26” power cord that plugs directly into a car’s cigarette lighter socket.