Electronic Keyless Digital Invisible RFID Locker Card hidden Lock for Private Drawer, wardrobe cabinet door lock 1. Master Card/keychain have been set for the lock, no need to be programmed or activated. All you need to do is to install 2 pieces AA alkline batteries, you can use the lock. 2. This is suitable for wooden Metal door , special for drawer, locker, cabinet, slidding door. 3. No need to drill holes, No damage to your cabinet. 4. Auto-rebounce and auto-lock function, easy to operate. 5. It is compatible with IC 13.56KHZ CHIP CARDS. 6. Stainless steel latch and ABS plastic lock body, durable and anticorrosion. 7. Motor life span is about 100,000 times, The Static Power Consumption less than 5μA. 8. One master card can be set to open several locks. so you only have to keep one key to control all locks