Hi, I prefer wired systems rather than a wireless system. In our house, we had a wireless security system installed and was not working properly. It was weak in obtaining signal strength and also low in image quality. There are a lot of articles regarding home security systems. I would suggest...
When it comes to hard-wired smoke alarms it is better to replace it after every 10 years. Great that it worked for around 15 years. Most of the detector makes a chirp sound and this is the time it's signaling is low.
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