The Teleporter is a support buildable that can teleport allies from Point A to Point B. It is compromised of an Entrance and Exit.
The teleporter effectiveness can be mixed despite if the engineer places where your team can get to an objective enemies can find it where it is since the teleportation is extremely loud and enemy team members can destroy it or kill anyone teleporting through. Also it lacks the deadly detonation of the dispenser. So engineers should place an entrance near in the spawning zone since there is an indestructible ceiling (or ground turret) and the exit teleporter in a place that will either dim the sound of teleporting or the enemy will rarely travel to.