MB Quart GMR-RB4 Plug-and-Play 4-Circuit Relay Bank for GMR7V1 Source UnitBRAND NEW MB QUART GMR RB4 Plug and Play 4 Circuit Relay Bank for GMR7V1 Source Unit (Sold Separately) The GMR RB4 relay bank features four 20 amp (max) circuits that are plug and play and controlled by the GMR7V1 Source Unit (sold separately). This allows users to easily add, wire, and control any switchable 12V accessory in their vehicle. FEATURES & BENEFITS: Compatible Vehicle Fitment Universal Compatible Product Models Directly plug and play with