DOXIN 500W Watt DC 12V to AC 110V + USB Portable Voltage Transformer Car Power Inverter 500W car power inverter, convert DC 12V to AC 110V. Perfect for in-car use, powers up notebook/laptop, DVD player, digital camera, etc. With USB output, you can charge your cellphone, MP4, MP3... No more running out of batteries. Over temperature protection, overload protection, over voltage protection. Steady and precise output voltage. Built-in cooling fan with low noise.