DURACELL PROCELL 9VPRST Alkaline Manganese Dioxide 9V Batteries\r\n- Duracell Procell 9V Box of 10- Procell Alkaline 9V industrial batteries are ideal for powering professional devices, such as smoke/carbon monoxide detector.- Each battery comes with a quality warranty.- Design, safety, manufacturing, and qualification follow Procell's stringent battery standards.