This device comes under the category of ab belts.
This device comes in the category of ab belts.
In these which is the correct preposition?
Both (but there are more results with "off" in Google)
Hi varmaswathy
As a NES, but not a teacher, I would use: "This device comes under the category of ab belts."
Hope this helps
R21
PS "This device falls into the category of ab belts." would also work for me.