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 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 sounds during unlocking to indicate low battery. The lock can be used approximately 15 times after the warning. Replace the battery to resume normal operation. Hidden Invisibly Installed Design: The lock mounts inside the cabinet for a clean, hidden look. Unlock the cabinet door without external handles or visible mechanisms. Helps secure personal items and enhances child safety at home.