Energizer A23 Alkaline Battery is used in smaller devices like garage door openers, car keyless entry and many more devices This battery has a capacity of 55 mAh to 6.0V rated at 20K ohms at 21°C This battery can replace other batteries in sizes 1181A, A23BP, DL21, DL23, MN-21B, MN21, V23GA It has a plastic label with flat contact terminal Does not contain mercury It can be disposed off with normal household trash Can be used in keyless entry devices 12V power output