This pack contains 12 Energizer 9v Industrial Alkaline Batteries. These batteries were designed especially for use in power tools; providing consistent power which not only keeps devices running longer but also delivers excellent results. The Energizer Batteries, they have a very long shelf life and favoured by government departments, hospitals, schools/universities due to their high performance and great value. Other than power tools these can be used within calculators, radios, smoke detectors, utility meters and alarm systems.