SGZ312, a Door Bell device, acts as an End Device in ZigBee network. It does not perform permit-join function as a coordinator or a router for other devices to join the network. SGZ312 can be logically bound with a ZigBee Warning Device, like SGZ602A/B, to work as a door bell button. It has a ultra low power consumption during stand-by and supports low battery notification. SGZ312 is a wireless device without the need of cabling for easy installation.