Duracell Coppertop all-purpose alkaline batteries are not only dependable, they are also long-lasting. You can take comfort in a ten year guarantee (five year guarantee for 9V) in storage. They are great for many of the devices you use on a daily basis. And from storm season to medical needs to the holidays, Duracell is the number one battery you can trust. Battery Type: Alkaline; Battery Size: 9V; for Use With: Everyday Electronic Devices; Voltage: 9 V.