Description��100% brand newthe module complies with international safety standards， the control area and the load region isolation trench;with the power supply and relay instructions， pull off， disconnect does not shine;the signal input with signal common terminal will start with regular conduction;can be used as a microcontroller development board module can be used as home appliance control;the control DC or AC signal， you can control 220V AC load;there is a normally open and one normally closed contact;blue KF301 terminals to the control line is more convenient.Package included�� 5pcs Relay Expansion Board Module��1pcs/2pcs/5pcs The number of your choice��NOTE:As the effect varies from monitor to monitor， there is irrevocable slightly difference in colors between the color showed on your monitor and the real one， So if dear you can not accept this very little difference， be cautious before you making the orders.thanks for understanding.