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The Transmitter sends a narrow invisible Infra Red Beam to the Receiver on a continuous bases. Any interruption of the Beam between the Transmitter and Receiver sends a code to the Controller that can be used to start or stop the program. The remote Transmitter is a wireless connection between the Transmitter and Receiver. Both the Transmitter and Receiver have standard tripod screw mounts for attachment to photo style tripods and both use individual 9V DC Alkaline batteries.