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A transistor radio is a small portable radio receiver that uses transistor-based circuitry. Following their development in 1954, made possible by the invention of the transistor in 1947, they became the most popular electronic communication device in history, with billions manufactured during the 1960s and 1970s.
Radio frequencies and electromagnetic fields have been topics bandied about among left wing public health advocates since the 60s and 70s. Originally, high-voltage power lines and fluorescent light bulbs took the heat. When microwave ovens landed in households across America the issue rose up like a specter from the ashes again. Now everyone carries a cell phone and every wireless handset emits a certain level of radio frequencies (RFs).