There are two main types of home security systems, (DIY) do-it-yourself systems and professional systems (hard-wired systems), which are installed by a company and usually provide monitored home security. DIY security systems are wireless systems that are often a lot cheaper and easier to install than the professional systems.
DIY systems can be purchased from most local hardware or home improvement stores, and can provide a great level of basic alarm functionality. They are much cheaper than they used to be, with many more choices and features available. Wireless systems start at as little as $200, and usually include a couple of door and window sensors and maybe one PIR motion detector, but do not include monitored security. With a wireless security system, you will have to expect that quality and effectiveness will not be anywhere near a hard-wired system that is professionally installed. Professionally installed hard-wired alarms are usually thought of as more reliable because there is no chance for interference, because the sensors that trigger the alarm are connected to the alarm control panel by cables. A wireless alarm system is a home security package that again, consists of a control panel and sensors, but that are connected wirelessly or virtually, eliminating the need for any wiring. So, because there is no need for wiring, you are eliminating any installation costs, but you are sacrificing reliability.
Another downside, other than the level of security provided would be that with a wireless system, you will need to change the batteries in the sensors regularly, which can be a hassle. This is something that a lot of people tend to forget, which ultimately makes the system worthless.
Wireless security systems are becoming extremely popular due to their flexibility, ease of installation and cost. Like a hardwired alarm, a variety of sensors can be added to the system such as door/window sensors, PIR movement detection sensors, smoke detectors and carbon monoxide detectors. Another benefit of a wireless system is that you don’t need to install all of the added features at the same time. You can add features to your system as your budget allows.