PROXIMITY TELEPORTER
Ever wanted a teleporter with a non press-able button but still teleports, or maybe an invisible boundary? Well so did I, and here is what I came up with because I could not find it anywhere or if anyone has made it.

Needed materials-

-5 redstone
-2 repeaters
-1 comparator
-2 command blocks

Equation-
-Redstone clock+comandblock 1 (testfor @a[r=(radius)] + comparator + command block 2 (tp @ap x y z)

***The Y cooridnate is essential for this equation!***

Additional Notes

Works great for adventure map boundrys

10 diamonds and 50 + likes and i will put instructions on how to make a proximity wall out of this device