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This Opto-isolated will protect microcontrollers and sensors from high voltages leaking through, As a result, you can safely control larger appliances without the worries of high voltage feedback. You can also choose your trigger level by simply changing a jumper. For triggering at 5V place the jumper in its place, for triggering on GND you can simply remove the jumper.
Opto-isolated 2 channel 5V Relay Module Specs: