The client's goal was to create an IoT Alarm System that wouldn't require any special installation, would be very compact, and provide the required level of security. 

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We have developed the system, powered by a rechargeable battery, and remains autonomous for a month.

The system consists of Sensors and a Hub.

It is enough just to place the Sensors in the needed places - after turning on, the Hub will measure the initial distance to each of the Sensors and if any Sensor moves, it will sound the alarm. It will also start sending messages to the Mobile App.