Shinwa Sokutei Base Sensor Basic Wire Detection 79153 Deep/Electric

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It detects metal, wood, and plastic behind walls and notifies you with a light and electronic sound. Detection depth of detected object: approx. 35mm Power source: 1 9V alkaline battery (The included battery is for monitor use and may have a short lifespan.) Usable wall materials: plywood, gypsum board, reinforced gypsum board (not available depending on type) Detectable materials: wood, metal (no longer able to distinguish between wood and metal)