I have opened the package to check the contents and confirm that it works. I also use this at my entrance, and I am healed by the pleasant, expansive 432Hz sound every time I open the door. Product sound sample: https://youtube.com/shorts/cF1AEw3pg2o?si=lavCufmqwVwu_yD7 ・Adjustable melody: Harmonious melodies created by 8 resonance bars, achieving overlapping scales, adjustable chords, and an acoustic music box effect when visitors are detected. Delivers optimal sound to each visitor. ・High responsiveness: A manually adjustable system that instantly responds to airflow and movement. Continuous, smooth sound waves and instrument-level clear scales create a fantastic wind chime effect. ・Quick installation: Installation completed within 60 seconds with adhesive mount. No damage to doors or frames, and the lightweight design makes it easy to adjust the position. A door bell that is easy to operate while maintaining stable operating performance. ・Beautiful design: Solid beech wood provides natural warmth, and matte metal accents create a stylish contrast, resulting in a door chime bell that perfectly harmonizes traditional and modern aesthetics. Brings a high-quality feel to the design of the door chime. ・Healing sound design: The relaxing 432Hz frequency naturally calms the mind and emotions, and the gentle, sustained resonance creates a harmonious indoor sound environment. An entrance chime that promotes stress reduction and emotional stability. I am also selling it cheaper elsewhere. Thank you for viewing.