Feature: 1.Two Unlock Mode: Single-key Mode, Dual-key Mode. 2.Can be used with 4 x AAA 1.5V alkaline batteries or a USB power adapter. The batteries can last 8 months under normal use. 3.The sound alarm will alert when the voltage is low. When the batteries become too weak to operate, the door will open automatically.4.Installation Template, Double Stick Tape and User Manual are provided in the kit. Operation Instructions in Single Unlock Mode 1.Initialization: After installing the battery, hold on the RESET button (passing a small hard object through the hole in the front of the lock cylinder to press the reset button). When you hear a "Di" sounds, release the hand. The lock beeps: "Di, Di, Di, Di, Di" (five short beeps). At this point, the lock is initialized (clear lock record) state, in Single Mode. 2.Set Master Card: After initializing, the first card (RFID Card / Tag) is swiped in the sensing area of the lock body. After a sound ("Di-Di") is made, the card becomes a Master Card. Master card can be used to unlock the cabinet door, add or delete the user card. 3.Set User Card: Swipe the management card (After reading successfully, the lock beeps "Di", in an unlocked state, user card can be configured), put card on the sensing area untill you hear a short beep which means the setting is successful. The user card can be setted continuously (up to 11 pcs). 4.Operation instructions in Dual Unlock Mode is available in User Manual. ONE KEY FOR MULTIPLE LOCKS - This RFID locks are programmable, and you can use one key (RFID card/fob) to unlock several cabinet locks as you want. The only thing you need to do: program the key into the locks and test it before installation. SUITABLE FOR WOODEN CABINETS - RFID cards can penetrate through thicker wood panels (up to 38mm/1.5 inch) and the key-fobs are basically convenience items with slightly less power, for making duplicate keys. Fits doors up to 0 -1.2 inch thick, Perfect of cabinets, lockers, cupboards, carts, data racks,