This appliance can be used to trim beards. Do not use it for any other purpose.
The cutting element of a beard trimmer is usually smaller than that of a hair clipper. The comb is smaller, to allow you to easily reach under the nose. Beard hairs are usually stiffer than scalp hairs. They therefore don't need to be lifted in the same way as scalp hairs. This is reflected in the comb design.
If you use a beard trimmer to trim hair on other body parts, you may experience reduced performance or even skin damage.