Radio

Radio is a means of communication used by Transformers.

A radio transmitter is a component of Transformer anatomy allowing them to communicate using radio, rather than sound.

Fiction

Generation 1

Freedom Fighter and Radio AM Robot are able to receive radio signals in the AM band.

Marvel Comics continuity

Optimus Prime controls Roller up to 1,200 miles and his Combat Deck up to 1,500 feet through radio control.

Soundwave and Blaster are particulary adept at detecting very faint radio signals. Both of them serve as mobile communication stations. Soundwave can maintain contact with fellow Decepticons 100 miles away and Blaster can transmit 4,000 miles.

In ray-gun mode, Shockwave can emit a variety of high intensity electomagnetic energy, including radio waves.

Fortress Maximus radio controls his drone units Gasket and Grommet and their combined form Cog. Transformers Universe

Radio can be used by Transformers over long distances. However, it is possible for these transmissions to be intercepted by a third party. When in doubt, in person communication is more secure. The Transformers

A Transformer's head, when removed from his body, can operate the body by radio control. Prime Time!

Headmaster partners can control their Transformer by radio-command. Broken Glass!

Cartoon continuity

During their undercover operation to investigate a smuggling ring that was stealing airplane components, Slingshot found out his radio transmitter was removed and was, thus, unable to contact Silverbolt and the Autobots. Aerial Assault