brand new and high quality Features: Sensitive Sound Sensitivity: Align with the high-sensitivity metal of the earphone to improve sensitivity and sound quality. More convenient use experience. Easy to Operate: The sound can be made of wood/coaxial, window, door or armor plate. Has good compatibility. Powerful Function: The function is compact and complete, with charging hole, earphone hole and up switch knob. Humanized design, easy to use and adjust. Excellent Sound Clarity: It can be used anywhere, even indoors or in buildings, and built-in lithium battery, which is easy to operate and carry. Wide Application: Can be used for pipeline side leakage/floor heating detection/water body detection. Applicable to all kinds of pipeline materials, floors, pipelines, etc. Specification: Current Consumption: 10mA Battery: Built-in 9V Battery Working Temperature: -20-50 Sensitivity of Measuring Element: -70db The Highest Audio Magnification: 20000X Material: ABS + Electronic Components Size: approx.61x35mm Color: Black Quantity: 1 Set Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Includes: 1 x Earphone 1 x Detector for Head 1 x Data Cable (other accessories demo in the picture is not included )