Change the way you protect your trailer investment with the Endurance Engager break-away system! Push button battery tester lets you know your break away system is ready to go. Endurance Ground terminals protect the ground surface against corrosion. LED Test break away switch confirms power is passing through the switch to the trailer brakes. Built-in battery charger charges battery while connected with the tow vehicle. Kit includes a LED Test break-away switch and cable and three mounting bolts. For use with trailer equipped with up to 4 trailer brakes. Includes a 5A 12VDC rechargeable battery. Break-away kits activate trailer brakes upon separation from tow vehicle. Most states and provinces require trailer break-away kits.