This inverter plugs into your cigarette lighter to power laptops, DVD player, cell phone chargers and other small electronic devices in your vehicle. Stable, precise output voltage, has latest soft-start technique overload protection, overheat protection and over voltage protection. Plus, when input voltage drops to 9.7-10.3 volts, the inverter will automatically shut down to prevent battery damage. Besides, it has built-in cooling fan to reduce noise.