RB has been challenging the conventional thinking of off road equipment for over 26 years, and the ARB Air Locker has been a success from the very beginning. Created to provide 100% traction on demand, without sacrificing any of the vehicles highway driving performance. ARB Air Lockers employ a 12 volt air compressor (sold seperately) to activate, and deactivate, a solid and durable locking mechanism inside the differential. This provides the traction you need, when you need it, at the flip of a switch, all within the comfort and safety of the drivers seat. Each locker is manufactured from the highest quality alloy steels and when purchased with the compressor, includes everything required for proper installation such as switches, air lines and fittings. Professional installation recommended but not required.