About This EXCELLENT PERFORMANCE: The service life of 6LR61 9v alkaline batteries is 6-8 times that of ordinary carbon 6f22 9v battery. The smoke detector battery provides long-lasting power and reliable performance for fire alarms and other devices. SAFE AND LEAK-PROOF: 6LR61 9 v battery alkaline got CE certification, The square battery 9v shell is made of corrosion-resistant steel shell with good sealing, which can effectively prevent the 9v battery for smoke detector from leaking during transportation and use. WIDE APPLICATION: 9v battery for smoke detector, eliminator, gun safe, garage door opener, transistor radio, bass guitar, bathroom scale, metal detector, paintball gun, microphones, multimeters, measuring instruments, infrared thermometers, etc. ENVIRONMENT FRIENDLY: 9v batteries for smoke detector don’t contain Hg/Cd/Pb, the composition of 9 v batteries for smoke detector is environmentally friendly and 9volt battery pack will not cause pollution to the environment, contributing to a green and healthy life. 100% Satisfaction Guarantee: If you have any dissatisfaction or questions about our batteries 9 volt size pack, please feel free to contact us. We will provide you with solutions and return services. Overview Number of Batteries : 8 9V batteries required. Brand : DURNERGY Battery Cell Composition : Alkaline Battery Capacity : 9 Volts Recommended Uses For Product : smoke alarms