NFC SETTING: For Android, copy your rfid key to your smartphone wallet via NFC function. For IOS, add a new transit card to compatible with Apple Wallet, then program the transit card to your lock as an NFC access card. HIDDEN LOCK, INVISIBLE STYLE: Refuses to damage the appearance of the door. Easy to install DIY, no need to drill, just install with screws. Has the function of automatic springback and automatic locking. The lock is suitable for doors less than 1.2 inches thick, ideal for gun cabinets, medical carts, computer racks and safes, etc. Not suitable for metal doors. LOW CURRENT ALARM AUTO-UNLOCK: The motor life is about 100,000 times, the static current consumption is less than 5A. Powered by 4pcs AA alkaline batteries, which can be used for more than 12 months. Low battery status with a long beep after being opened. After the long beep, the lock can be used about 15 times. When the battery is too low, the lock will automatically open, at this time the battery must be replaced before it can be used again. EASY TO USE: The master card/key ring has been set for the lock, no programming or activation is needed. All you need to do is install 4pcs AA alkaline batteries, then you can use the lock. You can program the keys in the lock before installation, so that you can use one FOB (rfid card/tag) to open multiple locks. WIDE APPLICATION: This intelligent cabinet lock has a stainless steel latch and an ABS plastic lock body, which is durable and corrosion-resistant for long-term use. This cabinet lock is only suitable for wooden doors, and is widely used for drawers, cabinets, cupboards, sliding doors. Independent reset system can recognize all cards (no more worries about losing the card).