Installation is simple: Just need to open a 12 mm through hole, and then screw four screws on the panel and three screws on the lock. Function can be switched freely, temporary password or fixed password can be set. Function can be switched on the lock by itself.Widely used in lockers, lockers, office cabinets, drawer cabinets, sauna cabinets, mobile cabinets, storage cabinets, etc Made of high quality Zinc alloy material, sturdy and eco-friendly, durable and safe to use.Compact design, exquisite workmanship and elegant appearance. There are different sounds and lighting hints for incorrect password, correct password and insufficient power.