NFC SETUP: For Android, copy your RFID key to your smartphone's wallet via NFC function. For iOS, add a new transit card in Apple Wallet and then program the transit card to your lock as an NFC access card. HIDDEN LOCK INVISIBLE STYLE: Designed to preserve the appearance of the door. Easy to install with no drilling requiredsimply secure with screws. Features auto-rebound and auto-lock functions. The lock fits doors up to 1.2 inches thick, ideal for gun boxes, medical carts, data racks, and safes. Not suitable for metal doors. LOW POWER ALARM AUTO-UNLOCK: Motor lifespan is approximately 100,000 cycles, with static power consumption less than 5A. Powered by 4 AA alkaline batteries, providing over 12 months of operation. Low battery is indicated by a long beep after opening. After the beep, the lock can be used approximately 15 more times. When the battery is critically low, the lock will automatically unlock and must be replaced before further use. EASY OPERATION: Master card and keychain are pre-programmed and ready to use. Simply install 4 AA alkaline batteries to begin operation. Keys can be programmed into the lock prior to installation, allowing one FOB (RFID card/tag) to open multiple locks. WIDE APPLICATIONS: This intelligent cabinet lock features a stainless steel latch and ABS plastic lock body, offering durability and corrosion resistance for long-term use. Suitable for wooden doors only, commonly used for drawers, lockers, cabinets, and sliding doors. Standalone reset system allows recognition of all programmed cards, eliminating concerns about lost cards.