The mental radio was a small, square handheld telepathic transmitter attached to a head-piece by way of a length of cable.
It was first designed by the Amazon scientist Paula, but later versions of the radio were developed further by Wonder Woman. By placing the headband upon a user's forehead, one could mentally communicate across vast distances. Wonder Woman routinely used the mental radio to communicate with her fellow Amazons on Paradise Island, even if she was beyond the dimensional breach separating Paradise Island from the rest of the planet Earth. The technology used in the Mental Radio is similar to that which allows Wonder Woman the ability to mentally summon her invisible robot plane.
On Earth-Two, Wonder Woman kept a mental radio in her apartment where she lived under the alias Diana Prince. She often used it to keep in contact with her superior Steve Trevor, and it became particularly useful for alerting Wonder Woman whenever Steve was in trouble. Wonder Woman also gave a mental radio to her friend Etta Candy. Etta kept it in her dorm room at Holliday College, where her fellow sorority sisters the Holliday Girls and she could use it to keep in contact with Wonder Woman whenever they needed.
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