what is the active ingredient a bed bug exterminator uses to kill bed bugs?

my moms getting a exterminator and i need to make sure that he is a bed bug zapper not a roach killer etc…
so i need ro know the common engredients ussually used to kill bed bugs and most effective
an exterminator uses

The links below will be useful and the chemical most often used is Deltamethrin

Boxter10 “The Roach Exterminator”

Exterminator $15.99 Exterminator

Roach $20 Roach

Housing Exterminator $20.99 Housing Exterminator