NFC SETUP: For Android, copy your rfid key to your smartphone's wallet via NFC fucntion. For IOS, add a new transit card at apple wallet and then program the transit card to your lock as a nfc access card. HIDDEN LOCK INVISIBLE STYLE: Refuse to damage the appearance of the door.Easy to DIY install ,no need to drilling,just installed by screws. Has function of auto-rebound and auto-lock. The lock fit for the doors less than 1.2" thickness, ideal for gun boxes, medical carts, data racks and safes etc. Not suitable for metal doors. LOW POWER ALARM AUTO-UNLOCK: Motor life span is about 100,000 times, the Static Power Consumption less than 5A. Powered by 4pcs AA alkanline battery, which can 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 approximately 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 OPERATION: Master Card/keychain have been set for the lock, no need to be programmed or activated. All you need to do is to install 4 pieces AA alkaline batteries, then you can use the lock. You can program the keys into the locks before installation that you can use one FOB (rfid card/tag) to open several locks. WIDE APPLICATIONS: This Intelligent Cabinet Lock features Stainless steel latch and ABS plastic lock body, which is durable and anti corrosion for long time use. This Cabinet Drawer Lock is suitable for wooden door only, widely used for drawer, locker, cabinet, slidding door. Stand-alone,reset system can be recognized all cards ( No more worries about the card losing problem).