Auto Meter BUSPRO-300 3-Channel Smart Battery Charger BusPro Series chargers utilize individual transformers and microprocessors for both low and high volume battery charging applications, which allows each channel to work independently and charge the battery correctly and in a timely manner. 5 amp per channel maximum with a 110 volt AC input. Contains Two LED lights per channel to visibly indicate whether the unit is connected, charging, topping off, completed charging, or a bad or reverse connection. Prevents overcharging and removes sulfation by means of a micro-controlled pulse current.