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.