Reno AVI-X Transmitter (4.5" diameter 'hockey puck')
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Automatic Vehicle Identification System Transmitter, Single Code
The Model AVI-X Vehicle Identification (AVI) Transmitter is a self-contained device that is easily installed on the underside of a vehicle. When power is applied the transmitter emits coded signal(s). The signal is picked up by a loop coil mounted in the roadway surface, which is connected to an AVI receiver capable of decoding the transmitted signal.