The application must be installed on two devices. One device must be in the car and the "In-car" mode must be activated on it. The other device should be located at the owner of the car, and on it the mode "Monitor" should be activated. If a GSM signal jammer works in the area of the car, the owner will receive an alert on the fact of jamming the signal.The application will work only if you have the Internet on both devices!Important! The application will only work if there is an Internet connection on both devices.