About this item: 
The module uses genuine quality relay, normally open interfaces , Maximum load: AC 250V/10A, DC 30V/10A. 
Using SMD optocoupler isolation, strong driving capability, stable performance; trigger current 5mA. 
Fault-tolerant design, even if the control line is broken, the relay will not move. 
The interface design of human nature, all interfaces are available through a direct connection terminal leads, very convenient. 
The Module can be set by jumper high or low trigger.