Which is positive which is negative

Where it says power next to where it says relay one and relate to which one is positive and which one is negative which one is closest to the edge

Hello Bobby,

Just answered your same question on Amazon, I’ve copied the answer here as below.

Sorry for the confusion, polarity doesn’t matter for all our receivers since 202U (both 202U & this 402U).

Our receiver will handle it, as long as the voltage is within specs.

Please let me know if you have other questions, thank you.

Hello Bobby,

Not sure if the problem is solved? I will mark the topic as resolved for now, just let me know if you have any questions.

Thank you.

My device is polarity dependent. Can you tell which power input terminal is directly connected to COM. Assume you are looking at the receiver with the terminals at the top.

Hello Vinay,

Our COM is by default floating (not connected to either power terminal).

You need to connect wires between COM & either power terminal, and COM will be positive if you connected to positive power, vice versa.

Please let me know if you have other questions, thanks.