1, the module uses genuine quality relay, normally open interfaces Maximum load: AC 250V / 10A, DC 30V / 10A;    
2, SMD optocoupler isolation, strong driving ability, stable performance; trigger current 5mA;    
3, the module voltage 5V, 12V, 24V to choose from;    
4, each channel module can be set high or low triggered by jumper;    
5, fault-tolerant design, even if the control line is broken, the relay will not operate;    
6, power indicator (green), 4 relay state indicator (red)    
7, interface design user-friendly, all interfaces are available through the wiring terminal direct connection leads, very convenient    
8, module size: 73mm * 50mm * 18.5mm (L * W * H)    
9, has 4 mounting bolts holes, hole 3.1mm, spacing 67mm * 44.5mm