This keyless entry system allows you to enter your home quickly day or night. Stops burglars by shutting down after three unsuccessful attempts to key the combination - then alerts those inside by sounding an alarm User programmable combination of 2 to 8 digits Two keys for manual override in case you forget the combination Replaces deadbolts on most doors Also includes keyhole cover Works on right and left handed doors Requires 4 AA batteries (not included)