DC 5V 12V 24V 2 Channel Relay Module 30A Relay Board Optocoupler Isolation Relay

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DC 5V 12V 1 Channel Relay Module 30A supports high and low level trigger relay

1Channel Optocoupler Isolation Module Photoelectric Isolator Signal 3-5V/12V/24V

6Pcs PC817 1 Channel Optocoupler Isolation Module 1CH Optocoupler PC817 3-5V 12V

PC817 2/4/8 Channel Optocoupler Isolation Board Voltage Converter Adaptor Module

1PCS DC 5V 1 channel Optocoupler Relay Module Support high and low trigger

AC 220V Optocoupler Isolation Module 1 Channel Voltage Detector Board Ttl 3-5V