What did Trevor Baylis invent in response to the need to communicate health information to the people of Africa?

In the late 1980s or early 1990s, Baylis saw a television programme about the spread of AIDS in Africa and realised that a way to halt the spread of the disease would be to educate and disseminate information by radio. Within 30 minutes, he had assembled the first prototype of his most well-known invention, the wind-up radio. The original prototype included a small transistor radio, an electric motor from a toy car, and the clockwork mechanism from a music box. Baylis filed his first patent in 1992.