In our MotorHome, we have a standard queen sized electric blanket. We often turn it on when it’s cold outside. Often “preheat” for 30 min, then level 1 or 2 for the night. Makes it much nicer!
On that Amazon link you provided, the 4th picture down it shows the max watts draw at 160w...
In comparison to a typical electric blanket, I use an old legacy Northern dual-controller queen electric blanket and it draws 180w on 120v AC power... I shut off my main 2800w inverter in the motorhome when I'm not needing it a lot of the time, so I have a little Bestek 300w inverter plugged into a cig lighter plug in the RV to run just the blanket at nighttime. Last night I ran it about at 5 on both dials and was cozy warm.
I also have a small Cannon electric blanket I use in my office chair when I start work in the mornings to use when the RV is a bit chilly until the heater gets going or the Sun comes up and gets warm enough. That one draws 130w on 120v AC power...