Powerful Audio Listening Device with Foldable Ear Amplifier for Wall and Door Sound Detection – Includes Earphone (Black) Next door sound detection with multi-function filter: 1. Suitable for use on wood walls, walls, doors, windows, and wall panels to capture voice sounds. 2. High-sensitivity sound detector allows clear audio pickup from adjacent rooms. 3. Includes headphones and audio output jack for connection to external recording devices, ideal for audio documentation. 4. Applicable for general listening purposes in residential or commercial environments. Package includes: 1. Main device: Compact size, black finish. Features charging port, headphone jack, volume control switch, and sound sensor located at the bottom (place against walls, doors, or panels for optimal performance). 2. High-definition stereo headphones. 3. Charging cable and storage box. Usage instructions: Charge the device fully, insert the headphones, place the sound sensor end against the desired surface (wall, door, etc.), turn on the power switch, adjust volume until clear audio is heard. For extended recording, connect an external recorder to the audio output jack.