BayGen Freeplay wind-up radio, 1995.

UNITED KINGDOM - DECEMBER 21: The world's first clockwork radio. It has three bands (MW, SW and FM) and needs no batteries, the power source being an internal spring-driven generator powered by hand. It is the brainchild of Trevor Baylis, the inventor of the Baylis generator, and was developed with funding from the British Overseas Development Administration. It is primarily aimed at people in developing countries where affordable energy sources are scarce or non-existent. Winding the handle for twenty-five seconds gives over 30 minutes listening time. (Photo by SSPL/Getty Images)