5V One Channel Relay Module Relay Switch with OPTO Isolation High Low Level Trigger Compatible with Arduino Raspberry pi ARM AVR

• There is a normally open and one normally closed contact.
• The control DC or AC signal, you can control 220V AC load.
• Blue KF301 terminals to the control line is more convenient.
• With the power supply and relay instructions, pull off, disconnect does not shine.
• The module complies with international safety standards, the control area and the load region isolation trench.