The latch and socket are made of metal, strong enough for privacy and security After it is turned on, it will emit a long beep and display the low battery status as needed, and can be used about 15 times after that. When the battery is too weak to operate, the door will open automatically, at which point the battery must be replaced before the lock can be used again. no drilling required. Easily fixed with screws. Powered by 4 AAA alkaline batteries (not included), lasts for with normal use an penetrate thicker boards (up to 38mm/1.5 inches). Fits wooden doors up to 0-1.2 inches thick, great for cabinets, drawers, lockers, cupboards, wardrobes, medical-carts, data racks, boxes, . Power Suplly:4 AAA batteries(Not included batteries) Colour:White Material:Metal+Plastic Package Contents: 1 * drawer lock +1 * installation package +1 * proximity card 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.