The Battery Tender will constantly monitor, charge and maintain your battery with 800 milliamps of charging power, even when submerged underwater. With an interior that is completely encapsulated and protected from shock, vibration and moisture, this unit is as durable as they come. It's no larger than a standard computer mouse and weighs only 1 lb. Use it for boats, watercraft, ATVs and motorcycles in all situations where water is a threat. International universal input voltage works anywhere in the world. Reverse-polarity and short-circuit protected. 100-240 AC volts. 50/60Hz. 3-year manufacturer's warranty. Includes ring terminal harness and alligator clips.