Smart Invisible RFID Electronic Drawer Cabinet Card Lock Security Keyless for Home Office RFID cabinet lock can be opened by RFID cards provided, or smartphone with NFC function by using a trick. If you are looking for a cabinet lock that can be accessed by smartphone for sure, we recommend you the Bluetooth APP version cabinet lock. If your phone is NFC card copying supported, you can copy/add the existing RFID user card to your smartphone's wallet and then use it as a cloning access card. You can also get/add a digital transit card to your smartphone's wallet, and then you can program this digital transit card to the RFID lock as a new NFC user card. (Reminder: some transit cards may not work due to the regional restriction on smartphone NFC cards.) Use 4 AAA alkaline batteries as the only power supply, when the battery-low beeping alert sounds, please replace the batteries ASAP. Hidden RFID lock can be applied to wooden cabinets, drawers, wardrobes, lockers, boxes, gun boxes, liquor cabinets, etc. The lock parts can be installed in different direction depending on different application scenarios, horizontally or vertically. This RFID cabinet lock can be also applied to double door cabinet by installing a double door clip.DIY installation for your own preference. Useful Tips: you can prepare some tapes for positioning the parts temporarily during installation. Package include: 1 x RFID Hidden Cabinet Lock Set Including 1 card, 2 keychains, suitable for door thickness less than 2.5cm (batteries not included) Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm) Thanks for your support :)