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Work on wooden walls, doors, windows, metal plates, etc. Suiable for sorts of construction pipeline leakage detection. You Can regulate the sound size; Switch the 2 probes in line with situation, adding probe and feeler. The audio device works by means of amplifying the vibration of audio. When humans chat in the room, their voice is simply a band, and in step with the dimensions of they speak, the band will journey by way of brief and prolonged distances and be amplified and amplified by way of manner of this device. Highly sensitive, please alter the audio slowly and punctiliously to avoid discomfort on your earbuds. Instructions for use: 1. Insert the probe or feeler into the audio enter 2. Insert the earphone into the audio output 3. The pink light is on when charging; Full charge, red mushy is going out. Colour:black Material:Metal Package Contents: 1 x detector 1 x probe 1 x feeler 1 x charging cable 1 x earphone Only the above package content, other products usually are not included. Note: Light and assorted displays could cause the color of the object in the photograph just a little different from the real thing. The size allowed error is +/- 1-3cm.