Alkaline (manganese dioxide) chemistry provides long-lasting power to 9V-devices like smoke alarms, hand radios, and more Wide operating temperature range of -30°C to 55°C ensures your devices don't quit in the cold winter weather Snap connectors easily attach to compatible devices and stays snug and secure to ensure continuous energy transfer 5 year shelf life keeps your batteries fresh, so you can buy in bulk and have backups for when you need them most