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The model DXT-21 2-button, 1-channel handheld transmitter is a battery powered portable transmitter designed for use with Linear’s dx format receivers. Each transmitter can be used in a limitless number of wireless remote control applications. Pressing a button on the transmitter sends a digitally coded wireless signal to its companion receiver. The dx transmitters are pre-coded at the factory to unique codes, so no field coding is required. The digital dx code format features over a million possible codes and transmitters can send a signal for up to 10 seconds per activation.