8-36v 4-channel multifunction time delay relay interface board module optocoupler led

with 4 channels of input and output control, each channel can be set to 20 kinds of functions to meet more application requirements. dc 8v-36v wide voltage input, with the function of power anti-reverse connection, will not damage the module due to wrong power connection. with power indicator light and relay suction indicator light. at least 1 second timing function can be set, accurate timing, error less than 1%. add automatic power saving function..syi