1.5 volt batteries are designed for use in watches, laser pointers, car alarms, calculators, PDAs, electronic organizers, electronic books, pet collars, medical devices such as digital thermometers and glucose monitors, sporting goods such as pedometers, calorie counters and stopwatches and hardware devices such as tape measures, stud finders and electronic levels.1.5 volt batteries are designed for use in watches, laser pointers, car alarms, calculators, PDAs, electronic organizers, electronic books, pet collars, medical devices such as digital thermometers and glucose monitors, sporting goods such as pedometers, calorie counters and stopwatches and hardware devices such as tape measures, stud finders and electronic levels.