This is for on brand new 12 volt battery charger. It has never even been out of the box. This version is a float charger. It is used to protect and maintain batteries that are not used all the time, such as Boat batteries, Motorcycle batteries, RV batteries, etc. when in the off season or between long periods of no use. You can even leave the battery in the vehicle and hooked up. Float chargers are much better than trickle charges as they operate under the battery degassing point, making them much safer and better for your battery and they use less electricity. This work on standard 12 volt lead acid batteries and gel batteries. This was a duplicate gift, so I have no need for it. Ony asking $19. If interested, please email me at this ad. Or you can call me. No texts as this is a land line. Thanks for your interest.