CTEK (56-864) MUS4.3 12 Volt Fully Automatic 8 Step Battery Charger Fully automatic charging and maintenance in 8 steps maximizesbattery life and performance Water and dust resistant means it is safe to use in all climate situations No sparks, short-circuit proof and reverse polarity protected makes it safe for all the vehicles electronics and easy to use Patented maintenance charge for a unique combination of maximized life and performance Numerous accessories simplifies using the same charger for multiple battery applications