[brk-lnt]

Originally Posted by SailinAway

The specs are here: https://us.comtrend.com/ar-5381u/

If I'm reading it right it says 1 amp, which would be 120 watts?

It's 1A at the 12VDC output from the power supply, so 12 watts. And even that is more likely a peak value and not a constant value, realistically the average power consumption of it is likely under 10 watts. Your calculation then was essentially a yearly operating cost, not a monthly one.