8-channel multi-function relay control module, using industrial-grade high-quality components, carefully designed and processed, stable performance, simple operation, can be widely used in various power control applications. The module presets up to 20 kinds of functions, uses 8-36V wide voltage power supply design, and adds the linkage function of each channel, users can freely combine many new applications, such as sequential linkage, cycle linkage and so on. Note: The input signal detection interface can be either active-high or active-low. The user can select via COM port. If COM is connected to H, IN1-IN8 is active high, if COM is connected to L, IN1 -IN8 is active low! Module Port: Module voltage/signal input terminal: there are 12 line interfaces, all of which have terminals for user convenience VIN: DC positive pole GND: DC negative pole OFF: Power control terminal COM: Pommon end of photoelectric isolation signal input IN1-IN8: Input signal detection interface Relay load output: 24 - wire interface, all interfaces have terminals Colour: blue Material: plastic Package Contents: 1 * 8 Channel Relay Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.