When there can be simply be twenty or five around it is not like finding rats in a home. These bugs can be living in your property while in the hundreds and thousands. They're hiding in many hard-to-get- regions, only waiting to feast upon you.
Most of the so called best bed bug killer goods are worthless and gimmicky including sensors.
Additional dubious goods, like bed bug foggers, also known as a bomb, are made to fumigate your home. But the bugs are actually clever, and, when they smell a hazard, they're going further into their hiding areas, where they thrive, and will endure.