STANLEY PI500S Power Inverter 500W Car Converter: Dual AC Outlets, 3.1A USB Ports, 12V DC Adapter, Battery Clamps Provides on the go power with a lightweight, ergonomic design that charges up to 4 devices at the same time Connect the clamps to your vehicle battery for 500 watt continuous power; Use the 12V DC adapter inside your car for 120 watt power Dual 120V AC electrical outlets and dual 3.1 Amp USB ports allow you to charge and power smartphones, tablets, laptops, tools, and more Features built-in battery protection warning, indicating when the vehicle battery is running low Over-voltage 100 watt protection allows you to avoid blown fuses; ETL certified for performance and safety