Featuring SmartKey® re-key technology; re-key the lock yourself in seconds in 3 easy steps. Deadbolt operated by electronic keypad or key; backlit for increased visibility at night. Keypad stays lit for 30 seconds after inactivity. Customized automatic door locking after 30 seconds for peace of mind. One touch motorized locking. Lock your door with a single touch. No additional turning/twisting needed. Features 16 user access codes and 1 master code option. ANSI/BHMA grade 2 certified. Fits most standard residential door preparations - installs in minutes with just a screw driver. Comes with 2 keys. Lifetime mechanical and finish warranty, One year electronics warranty. 4 AA, purchased separately.