It can captures subtle sounds through the wall, which is perfect for detecting broken hose inside the wall and finding leaking locate. Features: High sensitivity, strong penetration, the penetratingpower is increased several times, and the sound quality is greatly improved. It can be connected to the display spectrum, recording pen, transmitter, wireless equipment, etc. , and can also be inserted into the two-channel wire to record directly. Small and light weight for easy carrying. Easy operate, cling to the door/window/wall, adjust the sound with the knob until you hear a clear sound. Able to get the sound out from the wooden/brick wall/windows/door. Effectively filter noise and detect sound faster. Specifications: Color: black Cunsumption current:12mAh Probe sensitivity: -60dB Working time: 5-7h Battery: 3.7V, 100mAh Item size: 37 * 34 * 27mm / 1.5 * 1.3 * 1.1in Item weight: 25g / 0.9ounce Package size: 93 * 80 * 37mm / 3.7 * 3.1 * 1.5in Package weight: 73g / 2.6ounce Packing List: 1 * Voice Listen Detector 1 * Earphone 1 * USB Cable 1 * User Manual