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Made of fine quality material, practical, easy to operate and use, has a long service life. Features: It has a wide range of uses and can be used for a variety of tests, works on wooden walls, doors, windows, steel plates, etc. Very sensitive, carefully adjust audio slowly, as not to cause discomfort to your ear-buds. This audio gadget works by amplifying the vibrations of audio. When people are talking in a room their voices are simply a waveband, and depending on how loud they are talking, the waveband travels short and long distances which are picked up and amplified by this device. Use fine quality materials, long service life and accurate test results. The sound can be collected separately, but when the device connector is plugged in, the collection function is turned off and collected by the device instead. When connected to a computer, it can be used as a U disk, and it can also be put into mp3 to listen to songs. Specifications: Material: metal Colour: black+silver Battery: 1 * lithium battery,450mAh Working range: 5m Working voltage: 5V Packing size: 100 * 100 * 40mm / 3.9 * 3.9 * 1.6in Packing weight: 500g / 1.1lb Packing List: 1 * Detector 1 * USB Cable 1 * Circular Probe 1 * Needle Probe 1 * Headphone 1 * User Manual