The Elevator Block is a teleportation device strictly based on height. Unlike other GPS devices, the Elevator Block does not require a GPS network (nor energy).
Two Elevator Blocks allow for teleporting between two different heights. Jump to move to the Elevator above, and crouch to move to the Elevator below.
The two Elevator Blocks must be placed on top of each other, in the same XZ coordinate but at different heights. They must be at least 3 blocks apart, and have no blocks obstructing the player from teleporting above them.
There can be multiple Elevator levels in one XZ coordinate (up to a total of 84).