The AIMS Power 2000 watt pure sine inverter with transfer switch ? ETL certified to conform to UL 458 standards and designed for RVs, boats or mobile businesses that need power for medium size devices. Easy to install. The inverter will quickly switch between city/shore power and battery power automatically, without any extra wires. Power microwaves, refrigerators, freezers, heaters, computers, tools, compressors and pumps. Includes a 2 year warranty. Compatible with any 12 Volt battery system.