Sold 4 Batteries Per Pack Long-lasting, reliable power. Individually date-coded. Battery Size: 9 Volt These Long-life Alkaline 9 volt Batteries provide the best, longest power source. Recommended for use in smoke alarms, flashlights, lanterns, calculators, pagers, cameras, recorders, radios, CD players, medical equipment, toys and electronic games. They are long lasting and dependable after years of storage. Include "freshness dating" on each package and battery.