Designed to make the maintenance of the battery in the vehicle easy and convenient;Easily shows the status on the battery and makes sure that the battery can always get the care it needs;Prolongs the life expectancy of the battery as it makes sure it can always be fully charged;Indicates when the harmful sulfation process begins;Fits US 800, MULTI US 3300, MULTI US 7002, US 0.8, and MUS 4.3 battery chargers