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

How much do bed bug exterminator cost in new york? How much do bed bug exterminator cost in new york?

Look in your local yellow pages and find a exterminator. Good Luck! =)