Student or Learner
Some watches are powered by light. A cell on the face of the watch converts light to electricity, which in turn is used to charge a rechargeable battery or capacitor. As long as the watch is regularly exposed to sunlight or fairly strong light, it will keep running.
Is the phrase in bold correct? Should another phrase be used? Are there errors in the sentences?
Many thanks, Svartnik and Abaka, for your help.