1. Linkage function of each channel; 2. With 4 channels of input and output control, each channel can be set with 20 functions to meet more application requirements; 3. DC 8V-36V wide voltage input, with power supply anti-reverse connection function, will not damage the module due to wrong power supply; 4. With power indicator light, relay pull-in indicator; 5. At least 1 second timing function can be set, and the timing accuracy is 1%; 6. Increase the automatic power saving function; 7. All setting can be saved automatically, and the setting contents will not be lost when power is off; 8. The trigger signal input terminal supports user selection, high level or low level pulse triggering; Colour:As Shown Material:PCB Package Contents: 1 x DC 8V-36V 4 Channel Multi-function Relay Module Only the above package content, other products are not included. Note: Light reflection 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.