E-ZPass is basically the same set up. (little box you place on the windshield)
http://www.howstuffworks.com/e-zpass.htm
The stickers that are coming out are more than likely have a "WORM" RFID coded patch in them that does not need a power source. The frequency of the Toll Sensor is enough to make it work.
http://electronics.howstuffworks.com/gadgets/high-tech-gadgets/rfid.htm
http://www.howstuffworks.com/e-zpass.htm
The stickers that are coming out are more than likely have a "WORM" RFID coded patch in them that does not need a power source. The frequency of the Toll Sensor is enough to make it work.
http://electronics.howstuffworks.com/gadgets/high-tech-gadgets/rfid.htm