HK residential building 無線門鐘 門鈴 Qusun wireless door bell in August 2021
<a href="//commons.wikimedia.org/wiki/User:Wendaoz_Saimu" title="User:Wendaoz Saimu">Wendaoz Saimu</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>