Sealey power inverter pure sine sealey psi1000 pure sine wave inverters have been designed to produce the same av frequency produced on the grid making them more reliable than traditional inverters without any fluctuation in power or performance operates from a 12v dc power supply found in cars caravans boats and hgvs high performance outlet eliminates electrical interference reducing noise levels during use suitable for powering small tvs laptops power tools and various electrica