Teleporters Alpha and Omega

The  were two limited time premium decorations released during the Treehouse of Horror XXV Event and sold together. They were two separate Teleporters, Alpha and Omega, that can be placed anywhere and are 2x2 in size each. Tapping on one Teleporters opens a pop-up with a disclaimer from Professor Frink, you can then teleport to the other Teleporter, instantly. If placed far apart this allows rapid jumping between two points in the Player's Springfield.

They returned during the Cyber Monday 2015 Promotion where the players got a refund (rebate) of 20 donuts.

About
In a parody of The Fly, Homer buys a matter teleporter from Professor Frink's yard sale. Bart asks if he can use it, but Homer refuses. That night, Bart tries to sneak Snowball II into the teleporter and at the same time, Santa's Little Helper jumps in. The pets come out of the machine as a creature with a dog's head at one end of its body and a cat's head at the other. A second creature with a tail at each end of its body emerges shortly afterwards. A fly lands on Bart's arm and thinking that he will become a mutant superhero, Bart grabs the fly and steps into the teleporter. He comes out with his normal head, but with the fly's body whilst the fly has his body.
 * Read the full article here at Simpsons Wiki.

Trivia

 * The Teleporters are from the Treehouse of Horror VIII Fly vs. Fly'