One Card for Multiple Locks: You can easily program one key card into multiple locks and reset, add, or delete key cards as needed. The lock uses 13.56MHz M1 cards, which offer improved sensitivity and security compared to standard 125kHz ID cards. 1.5 in RFID Detection Thickness: RFID technology allows card detection through wood panels up to 38 mm thick. Ideal for securing cabinets, lockers, drawers, closets, medical carts, data racks, storage boxes, safes, pools, libraries, factories, and offices. Sturdy Mechanism and DIY Installation: Bolt and mortise are constructed from metal for durable locking performance. No drilling required—install easily with screws. For non-wood surfaces, 3M tape is recommended instead of screws. Low Power Alarm and Automatic Unlock: The lock automatically remains unlocked when battery power is low, preventing lockout. A long beep sound indicates low battery after unlocking; approximately 15 operations remain before battery replacement is required. Hidden Invisibly Mounted Design: Installed inside the cabinet, this concealed lock allows hands-free door unlocking. Helps protect personal items and enhances child safety at home.