Feature: 1. [Multi Application] High-strength through-wall microphone can be used for pipe leak detection, floor heating inspection, and water detection. Suitable for various pipeline materials and surfaces such as floors, walls, etc. 2. [Multi Functional] Through-wall microphone amplifier features a charging port, headphone jack, and on/off knob for reliable operation and accurate sound detection. High-sensitivity metal construction enhances sound sensitivity and audio quality. 3. [Clear Sound] Voice listening detector delivers clear sound performance and can be used in various indoor environments, including buildings. Built-in 200mAh lithium battery with compact design for easy portability. 4. [Easy To Operate] The probe attaches to various piping materials, floors, and walls, allowing users to hear subtle sounds through the included earphone that are normally inaudible. 5. [Widely Used] Ear listening device amplifier works effectively on concrete, steel, wood, iron, and glass walls, hollow blocks, and various pipe materials and surfaces to meet diverse detection needs. Specification: Item Type: Through Wall Microphone Material: Plastic, Electronic Components Product Size: Approx. 61 x 35mm / 2.4 x 1.4in Current Consumption: 10mA Battery: 200mAh Li Battery (Included) Operating Temperature: -20°C to 50°C Applicable Surfaces: Cement Wall, Steel Wall, Wooden Wall, Iron Wall, Glass Wall, Hollow Bricks, and various piping materials and floors Monitoring Method: Headphone output; external speakers can be connected Package List: 1 x Through Wall Microphone 1 x Earphone 1 x Data Cable Note: 1. Manual measurement, please allow slight size variations. 2. This detector is designed for basic home use and has limited sensitivity compared to professional-grade equipment. It is intended for short-term testing. Users with advanced requirements should consider higher-performance alternatives.