Switches your PROWatt SW inverter on and off as shore power availability changes.An automatic AC power transfer switch that automatically switches between primary and secondary AC input sources to power a single AC output circuit. The PROwatt SW Auto Transfer Switch automatically toggles between AC power from the PROwatt SW inverter and AC power from another AC source such as utility or shore power to transfer to a single AC output such as a qualified load via a branch circuit.Specifications AC Input Voltage and Frequency: 120V AC 60HzAC Input Current: 15A (max)AC Output Voltage and Frequency: 120V AC 60HzAC Output Current: 15A (max)Transfer Time: 80 msDimensions: 3 25/32"L × 2 30/32"W × 2 24/33"DWeight: 1.4 lb. (0.64 kg)