Feature: 1. [Multi-Application] High-strength through-wall microphone for detecting pipe leaks, underfloor heating issues, and water leaks. Compatible with various pipeline materials, floors, and walls. 2. [Multi-Functional] Through-wall microphone amplifier features a charging port, headphone jack, and on/off knob for precise operation. High-sensitivity metal diaphragm enhances audio sensitivity and clarity. 3. [Clear Sound] Audio listening detector delivers excellent sound clarity for indoor and building use. Built-in 200mAh lithium battery; compact and portable design. 4. [Easy to Operate] The probe attaches securely to pipes, floors, and walls. Subtle sounds—inaudible without assistance—are clearly heard via the included headphones. 5. [Wide Compatibility] Works with concrete, steel, wood, iron, and glass walls, as well as hollow blocks, pipes, and flooring materials. Specifications: Item Type: Through-Wall Microphone Material: Plastic, Electronic Components Product Size: Approx. 61 × 35 mm / 2.4 × 1.4 in Current Consumption: 10 mA Battery: 200 mAh Lithium Battery (Included) Operating Temperature: –20°C to 50°C Compatible Surfaces: Concrete wall, steel wall, wooden wall, iron wall, glass wall, hollow bricks, and various piping materials and floor/wall types. Monitoring Method: Headphone output; external speakers can be connected. Package Includes: 1 × Through-Wall Microphone 1 × Headphone 1 × Data Cable Notes: 1. Measurements are manual; slight variations may occur. 2. This is a basic home-use device. Its sensitivity is lower than professional-grade equipment. It is intended for short-term, general-purpose use.