Powerful Audio Listening Device with Foldable Ear Amplifier for Wall and Door Sound Detection – Includes Earphone (Black) Next door sound detection with barrier-free multi-function filtering: 1. Suitable for use on wood walls, walls, doors, windows, and wall panels to capture sound. 2. High-sensitivity voice detector allows clear audio pickup from adjacent rooms. 3. Includes headphones and an audio output jack that can be connected to external recording devices for audio documentation. 4. Ideal for general listening applications in business or home environments. Package includes: 1. Main device: Compact size, black finish. Features a charging port, headphone jack, volume control switch, and built-in sound sensor at the bottom (place against walls, doors, or panels for optimal performance). 2. High-definition stereo headphones. 3. Charging cable and packaging box. Usage instructions: After fully charging the device, plug in the headphones and place the sound sensor at the bottom of the unit against the desired surface. Turn on the power and adjust the volume control until clear audio is heard. For extended recording, connect an external recorder to the audio output jack.