Give your old battery charger to your pesky neighbor who keeps borrowing it, and get yourself the latest in technology! The Griot's Garage Battery Charger II is designed to provide fast, safe and efficient charging to a wide variety of 12 volt battery types and sizes. Advanced microprocessor controlled circuitry is designed to run cooler for safer charging. Faster, safer, and certainly more efficient than 'old school' transformer type battery chargers. The quad-phase charging process, combined with active filtering technology, ensures that each battery gets the power it needs in a manner best for the health of the battery... ensuring that all energy is properly absorbed by the battery and restoring the battery's reserve capacity. This charger is so sophisticated you don't even have to know what type of battery you have! Clip it on to a Conventional, AGM, Gel Cell, Marine or Deep Cycle battery and it does all the thinking for you. 6' foot leads are attached to the clamps, so you can leave it outside your vehicle! Stores compactly, too! Great packaging, great technology, one lifetime purchase. Enjoy.