all locks are pre-programm. These locks are ABS. Two Unlock Modes:Use card to unlock(this is to use );User card + Management card to unlock(this is to use at business,such as hotel,massage etc). This Electronic Cabinet Lock Kit Set is used for cabinet,drawer,locker,storage box and etc.for household or business:supermarket,sauna club,gym,swimming stadiums,library,factory and office. Suitable for Wooden Cabinets & Drawers - The lock fits wooden doors less than 1 1/4inch thick. It is for locking cabinets, drawers, lockers, cupboards, carts, data racks, etc. RFID not work thru metal doors! It can provide good safety protection of your personal items while protecting your privacy. It also can improve children's safety ,avoid your children or kids free to open the drawers or cabinet doors. Small compact design. DIY Installation: No Drilling, installed with screws easily. with 2x AA batteries (not included) (the lock auto open when voltage is low). Colour:grey Material:ABS Package Contents: 3 x Lock without batteries 3 x lock buckle 3 x sensor patch 9 x key chain 3 x sensor card 3 Pack 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.