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I did the monitoring project. The following year I took a single step to do the monitoring of the residential elevators. At that time, I used the ST5832DT to do the transmission. Before I took the cable to work for a long time, I was able to fix it in an hour or two.
Some people say that with this kind of microwave wireless transmission equipment will there be radiation? In fact, I also consider this problem with this device. After all, complaints from the owners are not good. The launch power of this device is very small, basically do not have to worry about radiation problems, and you take the elevator up to tens of seconds of things, that kind of radiation can be ignored. 
Is elevator monitoring for video or wireless monitoring better?
There are many buildings that now use wireless monitoring. After all, it is a trend. Let's not talk about low-rise buildings first. If there are line monitors in some buildings with more floors, it is a very troublesome task to control the cables, and the maintenance work is also very time-consuming.