All locks are pre-programmed. These locks are made of ABS. Two unlock modes: Use card to unlock (ideal for home use); use user card + management card to unlock (ideal for business environments such as hotels, massage centers, etc.). This electronic cabinet lock kit set is suitable for cabinets, drawers, lockers, storage boxes, and similar applications in household or commercial settings such as supermarkets, sauna clubs, gyms, swimming facilities, libraries, factories, and offices. Compatible with wooden cabinets and drawers the lock fits wooden doors up to 1 1/4 inch thick. Ideal for securing cabinets, drawers, lockers, cupboards, carts, data racks, and more. RFID will not function through metal doors. Provides reliable security for personal items and enhances privacy protection. Also improves child safety at home by preventing children from freely opening drawers or cabinet doors. Compact, space-saving design. DIY installation with screws no drilling required. Operates on 2x AA batteries (not included). The lock will automatically open when battery voltage is low. Color: grey Material: ABS Package contents: 1 x Lock (without batteries) 1 x Lock buckle 1 x Sensor patch 3 x Key chains 1 x Sensor card 1 pack x Screws Only the above items are included; other products are not included. Note: Lighting and display differences may cause slight variations in the color shown in the image compared to the actual item. Measurement may vary by +/- 1-3 cm.