Replacement Lamp for Welch Allyn 03100Base: ScrewVoltage: 3.5VWattage: 2.5WFor use with Welch Allyn Otoscopes 20000, 25020, 21700, 20202, 25000, 25200, 74710, 97110, 97100, 97150, 92800 and 22811Replaces part numbers: WA-03100-U, WA-03100, 6783-03100-U, 5932, 543100, 566-9758, 5669758