TRE E-Locker is an electronic differential. The magnet in the E-Locker is powered, pushing
the gear to lock both axles, sending 100% traction to both wheels.
Electromagnetic Locking Mechanism
Push Button Solution To Traction Problem 
Locks And Unlocks When Necessary 
Improved Strength and Durability
A Must For All Traction/Off-Road Performance 
NO AIR LINES, NO COMPRESSOR - JUST TRACTION