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I have one of these (on an exterior garage door) and it’s one of the best upgrades I’ve made to my home. The original 9v battery has lasted 1.5 years so far, through the MI winters.
Schlage FE595 CAM 619 GEO Camelot Keypad Entry with Flex-Lock and Georgian Style Knobs, Satin Nickel – $87.19 @ Amazon