Looking at the schematic it is even more obvious now that the "ionic chamber" is only here to make people think there is something special to this device...
(Making us think it works like a particle detector, with only 27v and directly connected to the base of the transistor is nonsense )
The only real electronics in there is the VLF/everything receiver that will pick up some radio signal (depending of your location, time of the day etc), and will look like "signal lines"... If you are really lucky you may even find that metallic objects may have some effect on this radio signals.
But that will never be a RELIABLE method to detect buried metal.
Also, the way the thing is build it will pick up all kinds of noise and will beep randomly, then selective memory and some target (ie P.M.) advertising will do the rest.
At this price it is worth the trouble.
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