These Duracell Procell Alkaline Intense Power 9V D industrial batteries are specifically designed for use in high drain professional devices that require a high amount of power or peaks of power. Suitable for use with carbon monoxide detectors, smoke detectors, multimeters, medical devices and microphones. The batteries provide reliable power and can operate in temperatures ranging from -20 to 54 degrees Celsius. Size: 9V Ideal for carbon monoxide detectors, smoke detectors, multimeters, medical devices and microphones Can operate in temperatures ranging from -20 to 54 degrees Celsius Reliable Performance Excellent resistance to corrosion Designed to meet all major quality, safety and environmental standards Pack of 10