Push to Test LED's indicate fully charged, charging or recharge. Multi-Stage Integrated Charger provides a fast recharge up to 12.8 volts. Once battery is fully charged the automatic float mode is designed to provide a continuous charge without overcharging. Activates trailer brakes upon separation of trailer and two vehicle. For use on 1, 2 or 3 axle trailers equipped with electric brakes. Weather/corrosion resistant, heavy-duty polymer case to protect battery and charger. Quick and easy to install. Breakaway Switch with 7.5" lead wires. 5 Amp/hour Battery. Battery Box, dimensions - 5" x 4.125" x 4". Now with 3 versatile mounting options! Great for gooseneck trailers. 1 year limited warranty. Note Make sure battery is fully charged prior to towing.