Digital door lock with fixed password simple setup

Energy saving and environmental protection. The four section seven alkaline battery can be used normally for more than 10 months. Installation is simple, just open a 12mm through hole, then screw four screws on the panel and three screws on the lock. There are different sound and lighting indications for wrong password, correct password and insufficient power supply. Made of alloy high quality zinc material, sturdy and eco-friendly, durable and safe to use. Function can be switched freely, temporary password or fixed password can be set. The function can be activated on the lock by itself.