There are 2 types of door chime system, ie. the wired and wireless. I found that the bell of wired door chime system comes with pretty standard sound of "ding-dong", and the wireless door chime system has more variety of musical sound.
I use a wired door chime system, which the wiring had already been done by the developer. I installed a door bell switch with big button and water resistance circuitry, next to my letterbox, on the pillar which holds the main gate of my house.
Mounting a good and durable door bell switch is essential to ensure the door chime system continues to work for a long period of time.
可能搞壞電腦的「負閏秒」延後實施!融冰拖慢地球自轉讓計時員鬆一口氣
9 hours ago
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