When used, teleports Isaac to the next room that has not been explored yet.
The room that you are teleported into will be touching an explored room.
When used in a room with enemies in it, it will teleport Isaac back into the same room.
Isaac will teleport into the next normal room or Boss Room, meaning it cannot be used to enter a special room unless all other normal rooms/the Boss Room has been cleared.
If all rooms have been explored, including Secret Rooms, it will teleport Isaac to the devil/angel room.
If used inside the Devil or Angel room in The Chest/Dark Room, it will keep Isaac in the room.
If all rooms including the Devil or Angel room have been explored, it will teleport Isaac to the I AM ERROR room.
You cannot teleport to the Boss Rush room or Blue Womb entrance if you do not meet the prerequisites.
If used in the I AM ERROR room, it will keep Isaac in the room.
Notes
In Cathedral or Sheol, using the I AM ERROR room exit will bring Isaac to The Chest or Dark Room respectively.
This can still be done even if Isaac has the wrong corresponding item (Polaroid/Negative) for that floor.
On The Chest or Dark Room, Teleport 2.0 will teleport Isaac to the the devil/angel room instead of the I AM ERROR room.
Cannot teleport into the room containing Mega Satan, even if all other rooms are explored.
Synergies
Charged Baby: Leaving the batteries it generates around the floor allows you to save them up and have multiple charges to use at the end of the floor once everything is explored, maximizing the chance of getting to I AM ERROR.
The Battery: Having two charges by the end of the floor can guarantee getting to a Devil/Angel room and I AM ERROR, assuming the secret rooms have been explored.
Blue Map/X-Ray Vision/Spelunker Hat: Allows you to know the location of Secret/Super Secret rooms. You can explore these rooms yourself and save Teleport 2.0 for Devil/Angel Rooms or I AM ERROR.
Teleporting to the I AM ERROR room when all rooms on the map are explored is a reference to the error the item would otherwise cause.
It is as if the item is saying "ERROR, there are no more unexplored rooms left."
This item is one of the two reliable ways to reach the I AM ERROR room in game, the other being the Blank Card + ? Card interaction—another paradoxical situation.
Graines
PC 1SF8 M4WJ (Treasure room adjacent to spawn - Normal Mode Only)
Téléportation ! et la 
Télécommande du Docteur, à l'exception de leurs couleurs.
