The AIMS Power 2000 watt pure sine inverter with transfer switch - ETL certified to conform to UL 458 standards is ideal for RVs, boats or mobile businesses that need power for medium size devices. Easy to install. The inverter will switch between city power and battery power without any extra wires. Power microwaves, refrigerators, freezers, heaters, computers, tools, compressors and pumps. Includes a 2 year warranty.