Automatic Vehicle Identifier (AVI) Transmitter. Dual code transmitter encased in rugged housing. It can transmit up to 19,683 different codes using the standard Motorola code format. Furthermore, it is compatible with existing systems such as Detector Systems, IDC, US Traffic, and Reno A&E. AVI-X-1 model will constantly transmit its single code as long as power is applied to the unit. Voltage- 12 VDC (10 to 15 volts DC) protected from momentary overvoltage and/or voltage reversal. Frequency 375 kHz and complies with FCC part 15 for unlicensed operation.