ZigBee

ZigBee is a suite of high level communication protocols used to create personal area networks built from small, low-power digital radios. ZigBee is used in applications that require a low data rate, long battery life, and secure networking. ZigBee has a defined rate of 250 kbit/s, best suited for periodic or intermittent data or a single signal transmission from a sensor or input device. Zigbee range is from 10m to 1.5km . More about ZigBee protocol and Xbee modules