This is the 150 WATT DC 12V to 110v AC power inverter car charger adapter USB swivel, which can converts DC 12V to AC 110-120V, providing household power on the go in the vehicle. With this product, you can Power up your notebook computer, digital camera, GPS, DVD player, PSP, cell phone, iPhone, iPod, and Pads, just to name a few. And this production with the function of Short circuit, overload, overheat, low battery voltage, over battery voltage protections, that won't damage your appliance or vehicle. You can safely use it.