This complete breakaway kit brings your trailer to a safe stop by activating the brakes if the trailer completely separates from the tow vehicle. Built-in charger automatically charges the included battery while your trailer is connected. Features: Breakaway system activates your trailer's electric brakes if the trailer disconnects from the tow vehicle Brakes receive signal to activate when cable detaches from switch Built-in charger automatically charges battery while connected to tow vehicle Battery box can be mounted on your trailer frame so you can open it from either above or the side Durable, plastic case protects the battery from the elements Rubber O-ring seal keeps out moisture 12-Volt, sealed lead-acid battery is rechargeable Switch and battery box install on trailer frame - drilling required Hardware not included Convenient wiring diagram is printed on the box Kit includes breakaway switch, 0.5-amp charger, 5-amp-hour battery, battery box, and wiring Specs: Application: single-axle or tandem-axle trailers with electric braking systems Breakaway cable length: 4' Charger amperage: 0.5 amps Battery: Capacity: 5 amp-hours Voltage: 12V Battery box dimensions: 5-1/4" long x 5" wide x 3-1/2" tall 1-Year limited warranty