The latch and socket are made of metal, providing reliable privacy and security. When activated, the lock emits a long beep and displays low battery status as needed, with approximately 15 uses remaining after the warning. If the battery is too weak to operate, the door will automatically unlock, and the battery must be replaced before the lock can function again. No drilling required. Easy installation using included screws. Powered by 4 AAA alkaline batteries (not included), offering long-lasting performance under normal use. Compatible with wooden doors up to 1.2 inches (30mm) thick. Suitable for cabinets, drawers, lockers, cupboards, wardrobes, medical carts, data racks, and boxes. Power Supply: 4 AAA batteries (batteries not included). Color: White. Material: Metal + Plastic. Package Contents: 1 x Drawer Lock, 1 x Installation Kit, 1 x Proximity Card. Note: Light reflection and display differences may cause slight variations between the item color in the image and the actual product. Measurement error allowance: +/- 1-3 cm.