The Portable Teleporter is a player kept teleportation device. It can store power and like all Mekanism teleporters, energy drain increases with the distance the player teleports to. Right-clicking with this device in hand will open a GUI similar to that of the Teleporter Portal, allowing instant travel to any Teleporter Portals that the player has set up.
Note that in order for the Portable Teleporter to be functional, the complete Teleporter Portal structure does not need to be built; only the Teleporter block must be present (and supplied with power).
To use the teleporter, place a powered Teleporter block down, and assign a teleportation name. Next, open up your Portable Teleporter and Right-Click. Click the teleportation name, and then click set.