Yootop 5 PCS 5V 1-Channel Relay Module With Optocoupler Low Level Trigger for Arduino ARM PIC AVR MCU 5V Indicator Light LED 1 Channel Relay Module

1. this module is in line with international safety standard, control areas and load area have the isolation groove; 2. USES the loose quality goods relay; 3. have power and relay operation instructions, and bright, disconnect the dawn; 4. signal input signal, the public end and will often start conduction; 5. can be used as a microcontroller development board module, can be used as a home appliance control; 6. dc or ac signal control, can control 220 v ac load; 7. and one often opened a normally closed contact; 8. blue KF301 terminal line more convenient.