Energizer Alkaline 9 Volt Batteries — 4-Pk., Model# 522BP-4H

These Alkaline 9 Volt Batteries provide dependable power to a wide variety of household electronics such as smoke alarms, carbon monoxide detectors and walkie talkies. These batteries have a shelf life of up to 5 years, so you have power when you need it. A 4-pk. gives you backups.