battery tender 800 is a supersmart battery charger that will constantly monitor, charge, and maintain your battery. it's encapsulated and protected from moisture by an electrical insulation battery tender features and benefits: fully automatic maintenance free charging fully waterproof international design allows any input voltage (100-240vac) mountable lightweight this compact 800 ma battery charger has all the charge characteristics of its cousin the battery tender&reg; 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, synthetic epoxy resin compound. it's tough, affordable, and a strong, innovative battery charging solution. this charger is no larger than a standard computer mouse yet packs 800 millamps of pure constant current charging power. coupled with a brain (ic chip), the charger will constantly monitor, charge, and then maintain your battery --- even while totally submersed under water! perfect for all outdoor types of atv's, watercraft, motorcycles, boats, or anywhere water is a threat. international universal input voltage works anywhere in the world 100-240 ac volts 50/60 hz.