The Auto Meter 12 Volt BusPro-600s is designed for the industrial user. Each of the six 5 amp charge stations is independently controlled. Lights indicate Defective Battery, Charging, Maintaining, and Improper Connections. Each controller prevents overcharging and removes sulfating automatically by means of a micro controlled current pulse. Unit is also available as special order in 220VAC input.*Flat Rate Shipping does not apply to this oversize item.