PC817 Optocoupler Isolation Board 2/4/8 Channel 817 Voltage Isolation Module
Each channel of PC817 Optocoupler Isolation Board is independent, can control different voltage at then same time
The jumper cap can be used to determine whether the output terminal is high potential output or low output.
Pack of 2 pieces, it means you will get them two SAME units in one type, not two mixed types.