Battery Tender Waterproof 800 12V Battery Charger is a compact 800 milliamp battery charger that has all the charge characteristics of its cousin the Battery Tender Junior. It incorporates highly efficient surface mount technology electronic components. The interior is completely encapsulated, protected from shock, vibration, and moisture by an electrically insulating, thermally conductive, flame retardant, UL recognized, synthetic epoxy resin compound. It is tough, affordable, and a strong, innovative battery charging solution and is no larger than a standard computer mouse yet packs 800 millamp of pure constant current charging power. Coupled with a brain which is the IC chip, the charger will constantly monitor, charge, and then maintain the battery even while totally submersed under water. It is perfect for all outdoor types of ATVs, watercraft, motorcycles, boats, or anywhere where water is a threat. This unit will work anywhere in the world with an international universal input range of 100-240 AC volt at 50/60 Hertz. An optional 25 feet extension cord (part number 081-0148-25) is sold separately.