XIANQI About this item Multi-function Timer Module] This time delay relay controller board has multiple functions. The input and output are isolated by opto-couplers, enhancing the anti-interference capability. And, the timing relay switch adds anti-reverse connection to the power supply. Performance] The timing switch module has low power consumption and superior performance. Moreover, it has high stability and industrial grade circuitry. Meanwhile, the digital timer relay board has a wide range of applications and can be used in many fields Other features] The set parameters can be remembered forever even if the power is off. Also, the signal terminal can hold the voltage signal for a long time. And, the signal triggers the relay to close. When the time is up, the relay is disconnected during the delay. Applications] The digital timer switch module can meet the requirements of many more applications. And the digital timer delay can be used for timing, time delay, cycle timing, intermittent timing, etc., such as buck diy, timing switch, timing alarm control board, etc. Colour: white Size: 64.2* 34.8* 18.5mm Product List:1*Electrical spare parts