Smart Intruder Defense Enter random digits before/after your 4-digit code to to avoid prying,protects against code guessing in high-traffic homes/offices. Easy Auto-Lock/Unlock SwitchKeep the door unlocked without programming. Convenient for deliveries, kids' playtime,or moving days.Perfect for front door or garage door. Smart Auto-Lock CustomizationSet 2-99 second auto-locking. Perfect for forgetful families/tenants at main entries & garages. Keyless EntryManage access with 20 usercodes - perfect for homeowners & Airbnb hosts. Assign permanent codes to family/tenants and generate temporary codes for deliveries/cleaners. User-Friendly KeypadBacklit keypad illuminates dark entries. Silent mode ensures quiet entry for late - night arrivals or shared homes Universal FitOur Digital Lock Fits standard doors (2-1/8" hole, 2-3/8"/2-7/8" backset, 1-3/8"-2" door thickness). Note: not compatible with 1-1/2" door holes. Easy to install. Advanced