A transmitter helps send wireless or remote-control signals to a compatible receiving system, and this Intermatic RC939 version provides 3-channel capability using the RC939 reference. Multi-channel transmitters are useful because they allow control of more than one function or device from a single handheld or remote operating point.This part has practical value because the 3-channel design supports more flexible control than a single-channel alternative. A properly selected Intermatic transmitter helps preserve intended communication with the supported receiver system and contributes to more dependable remote operation.This type of part is especially useful when the original transmitter is missing, damaged, or no longer communicating properly with the system. That helps restore control convenience without replacing the full receiver side of the setup.Used in the proper application, this transmitter helps support dependable remote control and stronger day-to-day operating convenience. Intermatic RC939 3-channel transmitter Helps provide remote control communication with compatible systems Useful when replacing a lost, damaged, or unreliable original transmitter Supports more flexible multi-function remote operation Improves control convenience and system usability