The Trolmaster DSD-1 dry contact module provides users with a simple and flexible solution to control dry contact or relay devices. It allows the activation of various devices such as light apertures, pumps, temperature devices and more. The module can be manually controlled via a button and offers a smooth connection with the Hydro-X system. The plug and play package includes the DSD-1 dry contact station, a 16ft RJ12 cable, a 4ft RJ12 cable and an RJ12 T-splitter.