Linear 212LS-C26DCR-RT Electronic Access Control Cylindrical Lockset, Right Hand Opening (Black) Durable Construction Designed To Last More Than 10 Years Clutch Lever Design Long Battery Life (15,000 Keypad Activation) With Low-battery Alert (batteries Not Included) Passwords Are Stored During Battery Removal Easy To Install Into A Standard Cylindrical Door Prep (ansi 151.8) Durable Construction Designed To Last More Than 10 Years Clutch Lever Design Long Battery Life (15,000 Keypad Activation) With Low Battery Alert (batteries Not Included) Passwords Are Stored During Battery Removal Easy To Install Into A Standard Cylindrical Door Prep (ansi 151.8)