(ZigBee is a low-data-rate, low-power networking wireless standard used to control and supervise various systems. The IEEE802.15.4 standard that ZigBee is based on stipulates that the data transmission rate of ZigBee should be 20kbps, 40kbps or 250kbps, and the device using ZigBee should be able to work for at least two years without replacing the battery)