Latest Instruction Manual: Uploaded on the product page – refer to it before installation and use for accurate operation steps Flexible Access Management​: Store up to 100 user codes and generate one-time passcodes for cleaners, pet sitters, or guests; 3 backup keys are included. This smart lock is perfect for Airbnb hosts and offices needing centralized access control – no more lost-key hassle. Smart Auto-Lock & One-Touch Lock: This smart door lock's custom 5–60s auto-lock timer prevents forgotten locks (great for morning rushes). Both inner and outer keypads of the smart lock feature one-touch lock buttons – press to lock instantly (great for busy households after entry/exit), reducing "did I lock the door?" stress. ANSI/BHMA Grade 3 Security Protection: This keyless entry door lock features anti-peek virtual codes (blocks shoulder surfing) and a 5-wrong-attempt lockout. It also adds a Type-C port—works with power banks to prevent lockouts during vacations or power outages—providing all-round protection for families, offices, and renters. IP54 Weatherproof Durability​: The zinc-alloy body of this deadbolt lock resists dust/moisture for indoor/outdoor use (porches, garages). Its anti-pick cylinder thwarts break-in attempts, ensuring reliable performance even in harsh U.S. climates (e.g., heavy rain, snow). Simplified Design: Low Failure & Energy Savings: This smart lock has no redundant features, cutting its failure rate by 30%. It runs on 4 AA batteries that last 6+ months (no extra power drain)—reducing maintenance hassle for busy U.S. households that use this keyless entry smart lock daily. Fits Most U.S. Standard Doors​: This door knob with lock is compatible with most U.S. residential and commercial doors—no door modification required. It’s ideal for renovating old apartments or upgrading new homes to a front-door smart lock.