Home security systems are usually made up of parts that are suited for the specific room or outside area they are designed to monitor. However, there are some key components that all security systems make use of.

Motion Detectors
Motion detectors are a key part of almost all home security systems. Typically positioned in corners and movement choke points, they react when any motion is detected in the room. Depending on the system, you may be able to watch the video in real-time from your phone or other Internet connected device.

Main Panel with Keypad
Almost all home security systems make use of a main panel of some kind. The main panel and keypad are the brains of a home security system. The keypad is used to activate and deactivate the system. With a more advanced system, you may be able to use it to do things like program alarm settings.