The Nature Power 400-Watt Pure Sine Wave Inverters convert 12V DC power into 120V AC power and provides power similar to the power supplied from your home electrical outlets. The Pure Sine Wave inverter, as opposed to the Modified Sine wave inverter, is great for running high sensitive equipment that need clean power like computers, monitors, TVs. It will also support high starting power appliances like microwaves, and power tools. The electronic appliances are able to run cleaner, cooler, and quieter on pure sine wave power. So in return pure sine inverters can save energy costs and extend the life of appliances.