The Bretford E6 6-Outlet Electrical Assembly is compatible with all Bretford A/V and TV carts. It attaches to the top using the pre-drilled holes on the carts. It includes a built-in cord winder. This powerful unit allows you to connect many electrical units to the system. It easily mounts to the unit using pre-drilled holes. The built-in surge protection guards against accidental burn-outs.