There are still a lot of 433MHz devices available on the market. There are also, of course, operating at a frequency of 315 MHz, but they are much less common and, in principle, practically unused. These devices are mainly used to make security systems, because, firstly, sensors, for example, there are 3 doors that do not depend on any additional gateways, and therefore it is much easier to integrate them, and their reliability is, in principle, quite high, because they do not lock up during operation. In practice, the battery may not send any information at all and the trigger is triggered. If suddenly it is not necessary, the trigger does not occur, the door does not open, the door opens. On the contrary, I have such sensors for opening doors or windows. One of them worked for almost three years until the battery ran out. But actually, of course, the battery is not very complicated. The only thing is that the sensor needs to be disconnected from the surface, which is not very easy, and, accordingly, after that, of course, you can replace the battery, and at. In the connection of the surface, he has a special sensor there, which also sends the smart home system information that it has triggered, during the period of operation, he performed 103000 trigger data transfers, so many because he controlled a lot of people in the refrigerator, paired with the camera, he still feels good about the second sensor, during the time He completed only 18,000 shipments of work....

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Automation in a smart home should be useful and create additional comfort, but sometimes everything goes wrong… The reasons for this, and how to configure everything, see on my channel.