The battery packs complete with 12V plugs, sockets,strap and a level indicator, this battery box is a necessity for camping The battery packs complete with 12V plugs, sockets,strap and a level indicator, this battery box is a necessity for camping and RV caravan car ,with the features:1 Polypropylene co-polymer impervious to acid,gasoline,oil and solvents2 Optional external Power Take-Off kit ...