The MB Quart GMR-RB4 relay bank features four 20-amp (max) circuits that are plug-and-play and controlled by the GMR-7V1 source unit (sold separately). This allows users to easily add, wire, and control any switchable 12V accessory in their vehicle. Compatible Vehicle Fitment Universal Compatible Product Models Directly plug-and-play with the GMR-7V1 Source Unit (sold separately), giving users access and control to any 12V accessory via the GMR-7V1's digital switches. Installation The GMR-RB4 has a simple three-wire connection. Connect the relay bank to the GMR-7V1 (sold separately) via the male JST connector to the female JST connector on the GMR-7V1 labeled 'AUX TRIGGER'. Provide 12V power/ground to the GMR-RB4 via a 8 AWG wire with an 80A fuse on the 12V+ wire. Adding 12V accessories to each 20A (max) circuit is done via a simple 12V power and ground connection. Other Features Quickly and easily know which fuse is blown via the glowing LED indicator that will light as long as a load is still connected to the circuit. Details & Specs Type GMR-7V1 Accessory Brand MB Quart Series GMR Category Marine, Powersports Condition New Color Black Warranty 1 Year Compatible Vehicles Universal Accessory Dimensions 6.875"" x 2.75"" x 1.25"" Accessory Additional Specs Four 12V circuits – 80A(max) total / 20A(max) per circuit Proposition 65 Notice WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov