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Nortek: 1-Channel, 1-Button Handheld Transmitter The Model D-22A 1-Channel, 1-Button Handheld Transmitter is a single-channel transmitter normally used as a "panic button" in security systems. It is also used in many remote switching applications where a portable transmitter is required. Each transmission causes the red LED indicator on the front of the transmitter to light, showing that the transmitter is sending a signal and that the battery is in good condition. Test/operate pushbutton Test/operate LED.