These systems consist of an electronic device that is installed in a concealed area of your car. If your car is stolen, you can activate the device and it will emit a signal that can be used to locate your car.
Such systems can be effective over a radius of several miles, depending on local geography. Ask your car dealer, or nearby police department, which brands of recovery systems are supported in your area.
By installing an anti-theft recovery system, you may be eligible for an auto insurance discount.