All locks are pre-programmed. These locks are ABS. Two unlocking modes: Use card to unlock (this is perfect to use); User card + Management card to unlock (this is perfect to use in businesses, such as hotels, massage parlors, etc.). This electronic cabinet lock kit is used for cabinets, drawers, lockers, storage boxes, etc. for households or businesses: supermarkets, sauna clubs, gyms, swimming stadiums, libraries, factories, and offices. Suitable for wooden cabinets and drawers - The lock fits wooden doors that are less than 1 1/4 inches thick. It is perfect for locking cabinets, drawers, lockers, cupboards, carts, computer racks, etc. RFID does not work through metal doors. It can provide good safety protection for your personal belongings while protecting your privacy. It can also improve children's safety, preventing your children or toddlers from freely opening drawers or cabinet doors. Small, compact design. DIY installation: No drilling required, easily installed with screws. Operated with 2x AA batteries (not included) (the lock opens automatically when the voltage is low). Color: gray Material: ABS Package Contents: 1 x Lock (batteries not included) 1 x Lock buckle 1 x Sensor patch 3 x Keychains 1 x Sensor card 1 package x Screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.