Switch mode technology used for high efficiency, light weight and quiet operation. 120 or 230 VAC user selectable AC input voltage. Fully automatic operation. Can charge three banks of batteries simultaneously. No isolator necessary. Ammeter and LED power status indicator. Ideal for charging all types of 24 volt lead-acid batteries. Protecting from short circuit, over current, reverse battery connection. Ensure rapid and safe charging of all types of lead acid batteries, flooded, AGM, Gel cell or batteries with an external load. 10.7 inch L x 8.4 inch W x 3.3 inch H (7 lbs.). Owners Manual.