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Listening through walls.
Special pull back vechicle with secret listening device.
easy to listen all the action.
High sense metal probe.
Coming with earphone .
small as a jelly
complete function:charge hole,earphone hole and switch knob upside
easy operate,cling to the door,window or wall
Able to get the sound out from the wooden/brick wall, windows or door or armor plate
High sensitivity detector
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