Feature: 1. [Multi Application] High-strength through-wall microphone can be used for pipe-side leakage, floor heating detection, and water detection. Applicable to 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 accurate measurement. High-sensitivity metal construction enhances sensitivity and sound quality. 3. [Clear Sound] Voice listening detector delivers excellent sound clarity and can be used in various environments, including indoors or within buildings. Built-in 200mAh lithium battery; compact design for easy portability. 4. [Easy To Operate] The probe attaches to various piping materials, floors, and walls, allowing you to hear subtle sounds through the included earphone that are normally inaudible. 5. [Widely Used] Ear listening device amplifier is suitable for concrete, steel, wooden, iron, and glass walls, hollow blocks, and various pipe materials and surfaces to meet diverse 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 floor types 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 variations. 2. This detector is a basic home-use model; its sensitivity may not match that of higher-end models. It is intended for short-term testing only and should be purchased with consideration for intended use.