Robodo 1 Channel 12V Low Level Trigger Relay Module for Arduino Electronic Components Electronic Hobby Kit

"Isolation groove between the control area and the load area Has the power and relay action instructions, pull bright, disconnect does not shine If the input has signal, the beginning of the common and often will have conduction Can be used as a microcontroller development board Can be used as a home appliance control Control DC or AC signals Can control AC 220V load Normally open and normally closed contacts Blue KF301 terminal accesses control line is more convenient Packing list: 1 x Module"