Sofamel D-TUERI DUAL Mode D'emploi page 20

It does NOT work with DC electrical signals, nor behind
conductive structures such as the human body, metallic
elements that are grounded, trees and hedges, shielded
cables, underground cables, etc.
In DC
Metallic structures grounded
The device is sensitive to static electricity and
may sound discontinuous alarm signals when
levels are high.
Faced with obstacles
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