Zigbee Sensors: RFID Wifi Bluetooth Competing ...

Zigbee Sensors: RFID Wifi Bluetooth Competing: Via Wired News: Tiny Sensors Run Forever (Almost)

Joanna Glasner writes about smart homes and Zigbee sensor specification ...

... "ZigBee, which operates over unlicensed public airwaves, is far from the only wireless specification vying for consumers' attention: Wi-Fi, RFID and Bluetooth also transmit data over short distances in unlicensed spectrum. " ...