The Chefman air fryer is not a big unit, and would clearly suit 1, or maybe 2-person use.
Looking at the comparison table, there is a range of sizes from 3.5 to 12 litre capacity, so this is one of the smallest.
The 1200w heater then is more than adequate and would result in definite savings in electricity, cooking over a year.
Operation is easy, load the drawer with the food, and set the temp and time.
The dials will need cleaning carefully, there is a risk that the numbers will wear off.