BusPro Series chargers utilize individual transformers and microprocessors for both low and high volume battery charging applications. This allows each channel to work independently and charge the battery correctly and in a timely manner. The BusPro-620s has a 5 amp per channel maximum with a 220 volt AC input. This unit has two LED lights per channel to visibly indicate whether the unit is connected, charging, topping off, completed charging, or a bad or reverse connection. The BusPro-620s prevents overcharging and removes sulfation by means of a micro-controlled pulse current.