Designed with a sleed style to complement your home's interior, you can lock up your home office, wine cellar or storage room and never have to worry about keys; to gain entry, simply enter your personalized access code, while locking is as easy as touching a button; "SmartCode" is easy to install, program and use and operates on (4) AA batteries; it also features "SmartKey" re-key technology as the back-up keyway; fitw standard doors (1-3/8" - 2"); no new screw holes required.