The detector is extremely sensitive. It does not let you get to 5cm. It's short range limit is about a meter. This means you can detect some bugs, but it wouldn't be very helpful for locating one on a car where you need a more accurate and close range detection. It also would be hard indoor unless you have no furniture and have everything spaced out a ton. The camera detection works fairly well. Only good use I can think of is checking someone for bugs in a field with no other phone within a couple paces, or checking for cameras anywhere. I have another but I wanted another because the sensitivitity changes a lot, because it is a slider/dial, not level adjustment. It might be useful for just detecting the presence of a bug within a radius of a meter or so and then do a manual search but it's not what was advertised. Seems to be a pretty high quality build beyond that though.