1. Electronic intelligent invisible sensor lock without drilling holes, suitable for drawers and cabinet doors. The RFID cabinet lock can be opened with the provided RFID card. With a little trick, it can also be opened via a smartphone with NFC functionality. If you're really looking for a cabinet lock that can be opened via a smartphone, we recommend the Bluetooth APP version of the cabinet lock. 2. If your phone supports copying NFC cards, you can copy/add your existing RFID user card to your phone wallet and use it as a cloned access card. 3. You can also add a digital transit card to your phone wallet and then program this digital transit card into the RFID lock to make it a new NFC user card. (Reminder: Due to regional restrictions on phone NFC cards, some transit cards may not be available.) 4. It is powered by only 4 AAA alkaline batteries. When the beeping alarm for low battery power sounds, please replace the batteries as soon as possible. 5. The hidden RFID lock can be applied to wooden cabinets, drawers, wardrobes, lockers, boxes, gun boxes, wine cabinets, etc. Depending on different application scenarios, the lock components can be installed horizontally or vertically in different directions. 6. By installing a double - door clamp, this RFID cabinet lock can also be applied to double - door cabinets. 7. You can do a DIY installation according to your own preferences. Practical tip: During the installation process, you can prepare some tape to temporarily fix the components. 8. Package contents: 1 set of RFID hidden cabinet lock kit, including 1 card and 2 keychains, suitable for doors with a thickness of less than 2.5 cm (batteries not included). 9. Precautions: - Due to differences in monitors and lighting effects, the actual color of the product may vary slightly from the color shown in the picture. - Due to manual measurement, a 1 - 3 cm error is allowed. (1 inch = 2.54 cm) Thank you for your support!