ZigBee is an open industry
specification for unlicensed RF untethered peripheral control
requiring the lowest power consumption between compliant devices.
The ZigBee specification is a
combination of HomeRF Lite and 802.15.4v specification. The spec
operates in the 2.4GHz (ISM) radio band, the same band as 802.11b
standard, Bluetooth, microwave and some other devices. It is capable
of connecting 255 devices per network. The specification supports
data transmission rates of up to 250Kbps at a range of 30 meters.