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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.
The use of the telephone, for instance, is very widespread. In 1925 there were 15 subscribers for every 100 inhabitants as compared with 2 in Europe, and some 49,000,000 conservations per day. Wireless is rapidly winning a similar position for itself, for even in 1924 the farmers alone possessed over 550,000 radios.