Tachyon transmitter
From Transformers Wiki
Communications over vast interstellar distances can be tedious due to the finite speed with which radio signals can be transmitted. However, a tachyon transmitter which takes advantage of a family of particles that travel faster than light allows instantaneous subspace communication between distant terminals.
Autobot ships are normally outfitted with these transmitters. Ultra Magnus's ship had its transmitter mounted to the underside of its hull.
Fiction
Animated cartoon
Lugnut and Blitzwing stole the tachyon transmitter from the Elite Guard ship, so that Megatron could use it to communicate with his own forces. Mission Accomplished Due to its theft, the crew were unable to notify Optimus Prime and his team when Starscream escaped en route to Cybertron. A Fistful of Energon
