There are various systems available ranging from simple alarm devices to more advanced systems that have video cameras and are connected to a central monitoring unit or monitoring service.
A quality system can be very expensive. Therefore, it is necessary to consider various options. There are wireless systems, security cameras, security video systems and other products that you can buy and install yourself. You can also have a professional install the system.
A security system should keep intruders away. A yard sign or decal sign in the window that says that this house is protected by a security system and security service can be effective.