Who hid in the wall, I'm not guilty

The company Milwaukee is known as a manufacturer of all kinds of electrical equipment for builders: drills, screwdrivers, and so on. But I think this piece should be assessed by those who have tried to repair an old house at least once in their life (the option is to bring a new apartment into a low-rise high-rise apartment into a residential area).

SUB-SCANNER M12 (link to the American site, because I did not find this product in Russian) is a wireless detector that “sees” what is being done inside the wall. The material from which this very wall is made is unprincipled, it can be wood, drywall or even marble. The viewing depth is 6 inches (15.1 cm).

Thus, the machine is able to find wiring, beam, built-in safe or other cavity, as well as fittings and other "surprises", which are often opened even when the drill has damaged the wires, and the piercer has flown "somewhere inside" and the money is spoiled. Results are shown on a black and white display.
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The detector from a 12V lithium-ion battery works and costs, if I'm not mistaken, around $ 340.