The parallel box is used to pair 2 inverter generators for twice the power when needed. Includes 2 sets of power leads and ground wires for easy connection. Connects two Hustler Inverter Generators rated up to 3300 running watts. Panel Contains 2 IP44 weatherproof outlets and 30A breaker switch. LED lights used to display wattage power level. 120 volt and 30 amp breaker switch. Overall dimensions 17 3/4” X 20 7/8” X 17 1/8” .