Premium zinc-air batteries. 10 dial packs that contain 4 batteries per pack for a total of 40 batteries per carton. For maximum battery life follow these important recommendations:
- Store batteries in cool, dry location. Not in refridgerator.
- Do not remove activation tab until ready to install into device.
- After removal of tab, let battery "breathe" 2-3 minutes before use.
- Open battery door at night to extend battery life.