SOLAR OS6140 0-60/250 Amp 6/12V Automatic/Manual Charger/Starter/Tester with Timer 6 and 12 volt operation 250 ampere engine starting assistance Infinite adjustable charging amps up to 60 Amps in 6 and 12 Volt modes 10 Amp automatic charging mode Enhanced Transoid Transformer design for improved durability and increased efficiency