4 Ways to Unlock: Teeho keypad door lock with handle offers 4 ways to unlock—20 user codes, 2 backup keys, one-time codes, and passage mode. One-time passwords are single-use and automatically delete after use, providing secure, temporary access for guests or service personnel Easy Installation: This keyless door lock fits most standard U.S. doors (2-1/8 inch door holes, 1-3/8 inch to 2 inches door thickness)without extra drilling. The handle hole is adjustable and works for both left- and right-handed doors. Installation is simple—only a screwdriver is needed Auto Lock & One Touch Lock: Automatically locks within 10–99 seconds after the door closes; this feature is off by default and can be enabled if needed. Press and hold any keypad number for 2 seconds to lock instantly—no fumbling for keys or searching for a specific keypad keys ANSI Certified & Water-Resistant: The keyless deadbolt lock is made of premium aluminum and zinc alloy, tested to ANSI Grade 3 standards and BHMA certified. It features an IP54 waterproof rating, preventing water and rust for reliable use in rain, snow, or humid conditions Anti-Peeping & Anti-Cracking Passcode: Anti-peep lets you enter extra digits before or after your correct code to prevent others from guessing it. Anti-cracking passcode after 10 wrong attempts to prevent tampering Long Battery Life & Low Battery Alert: This electronic deadbolt is powered by 4 AA batteries (not included) and lasts up to 1 year. A low battery alert flashes red when power drops below 15%, giving you time to replace the batteries Customer Support: TEEHO offers 2-year warranty and lifetime customer service, including online phone support from Monday to Friday 9 AM to 5 PM PST and 24/7 online email service