Selectable lockers fall into 3 categories - Air, electric and manual.
Air lockers use compressed air from a vehicle-mounted air compressor to engage the locking mechanism.
Electric lockers use an electrical pulse to engage a magnetic locking device.
Manual lockers (OX) must be engaged by pulling a cord, usually requiring the driver to exit the vehicle (although many OX can be upgraded to electric).
Air and electric lockers can be activated by a switch inside the vehicle.
Selectable lockers are fully locked when engaged and function as an open differential when not engaged.
Some electric lockers function as a limited-slip differential when not engaged.
