RFID is in the toilet - Engadget - www.engadget.com.: "The device consists of three components: a tank sensor, a bowl sensor, and a control unit which includes an RFID reader and is powered by a standard coin cell battery which needs replacement every 5 years. If a sensor detects a problem, the RFID tag transmits this to the control unit which can emit an (audible) alarm or shut off the water supply. "
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