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The power supply for the ECU controller circuit board is back-up by a 9V battery. During
an ac power failure, the battery will maintain the transmitter operating configuration
stored in the controller logic circuitry. Once power is returned to the transmitter, the
transmitter will automatically resume operation in the configuration appearing prior to
the ac failure. If an extended ac power failure occurs, the transmitter will be operated to
off by an ac loss/auto shutdown circuit on the controller circuit board.