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 includes 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 users to hear subtle sounds through the included earphone that are normally inble. 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, meeting diverse application 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 variations. 2. This detector is a basic home-use model and its sensitivity may not match that of higher-end models. It is intended for general use and should be purchased with consideration of specific requirements.