Converts 220/240 foreign voltage to 110/120 U.S. voltage. For electronic equipment up to 50W: Cassette/tape players, calculators, strobes, rechargers, portable electronic devices, cell phones, MP3 players, electric shavers, and flash guns. Comes complete with built-in Continental adaptor pins and handy travel case. Warning: Franzus converters should not be used with power tools and electronic circuitry products such as computers or laptops.