And Various Piping Materials and Floors, Wall, etc. 【Easy To Operate】: The probe can be attached to a wide range of piping materials, floors, walls, and other surfaces, allowing you to hear subtle sounds through the earphone that you normally wouldn't be able to detect. 【Multi Application】: High strength through wall microphone can be used for pipe side leakage, floor heating detection, and water detection. 【Versatile Applications】: The ear listening device amplifier is suitable for a wide range of materials including concrete walls, steel walls, wooden walls, iron walls, glass walls, hollow blocks, as well as various pipe materials and floors, walls, etc. 【Clear Sound】: This voice listening detector boasts excellent sound clarity and can be used in various settings, including indoors or within buildings. KLLJRFW Voice Listen Detector Amplifier For Pipe Water Oil With a built-in 200mAh lithium battery, it features a compact design that is easy to carry. Applicable to various pipeline materials and floors, wall, etc. It can only be tested briefly and must be purchased with caution for more demanding requirements.