Schumacher makes a wide variety of hand-held portable chargers to meet a wide variety of needs. The metal hand-held portable chargers are made with all steel cases coated with baked enamel finishes. There are chargers for 6, 12 and 24 volt battery systems. Schumachers Signature Series has a rugged durability of polypropylene with the latest high-tech features and design. All of these polypropylene chargers come with reverse hookup safeguard and super-grip clamps for top and side-mount battery post.