Xantrex marine Boat 15A Inline Transfer Relay for PROwatt SW It comes with a power plug for convenient connection to the inverter GFCI and a hardwire cord for the AC input and output interface. An easy to mount 15A Inline Transfer Relay provides switching between shorepower and inverter AC source. It is available as an accessory to the Prowatt SW product line. Box Dimensions: 4"H x 7"W x 10"L. Weight: 1.9lbs.