Signalling Siren is a free Android application created by Samadjon in the Utilities & Tools category. This simple security solution is designed to send a call to the owner of the property if a hidden phone is shaken. It can be used in a shop, car, or any other place where a siren against thieves is required.

The application is easy to use and can be installed on cheap phones. Once installed, all you need to do is click "Listen" and leave it in a secluded place. The program will do the rest, sending an alert to the owner if any unauthorized movement is detected. Overall, Signalling Siren is a useful tool for anyone looking for a simple and effective way to protect their property.