There are many options for security systems, whether you want electronic monitoring done by a service you pay for or you wish to do yourself. If you hire out the work, than the company comes and installs everything you need. There will be an installation charge and a monthly charge for the monitoring service. In this scenario, the company is suppose to call the cops or come out to your house and check on you if the alarm is tripped. If you choose to install your own system, you don’t have to pay a monthly fee. But there will be no one to come check on you if the alarm is tripped.