Energizer LR44 Button Battery, 1.5V, 11.6mm Diameter

The Energizer product is a miniature alkaline battery. It has a long shelf life so they are always ready when you need them. Energizer multi drain technology will give you the same great performance in all low and high drain devices, from a simple analogue watch to the most complex digital, electronic watches.

Long Lasting Zero Mercury Specialty Battery
Nominal Voltage is 1.5 V
Reliably powers toys, watches, glucose monitors and calculators