Alkaline A23 Battery delivers optimal power for keyless entry and garage door openers. 12-volt battery is specially designed for electronic applications that may require high rate pulses. It is mercury-free. Cell size is A23. Miniature battery with a metal jack and flat contact is a replacement for 1181A and A23BP, DL21, DL23, MN-21B, MN21 and V23GA. Delivers long-lasting, dependable performance in specialty devices like heart rate monitors, remotes, keyless entry systems, glucose monitors, toys, and games. Optimal power for keyless entry, garage door openers, watch, camera, electronic books, glucose monitor and keyless entry car alarm. Perfect for devices that require high rate pulses. Responsibly designed: Mercury-free. Equipped with flat contact. Alkaline A23 Battery delivers optimal power for keyless entry and garage door openers. 12-volt battery is specially designed for electronic applications that may require high rate pulses. It is mercury-free. Cell size is A23.