This Hopkins Mfg Breakaway Engager Trailer Breakaway System Kit includes box, battery, charger, 7 inch switch and hardware. Specifications•Compatibility: 1-2 Axle Capacity•Includes Battery: Yes•Includes Battery Charger: Yes•Includes Battery Case: Yes•Includes Wiring Harness: No•Estimated Install Time (Hours):1 Built In LED Battery Meter With Box, Battery, Charger, Switch With 7 Inch Wire, Hardware | Hopkins Mfg. Hopkins Mfg Engager Trailer Breakaway System Kit