Photos: Tracking people with VoIP and RFID 
Published: 22 Mar 2006 15:25 GMT
The size and shape of the RFID tags vary depending on their application. IBM has developed some tags (such as the white one, third from the left) to be worn around the wrists of hospital patients. Other tag (such as the black one that is fourth from the left, have been designed specifically to be embedded in car tyres









