Professional CCTV monitoring is a popular service offered by security companies and guards. It is where a security guard or other suitably trained professional will monitor CCTV from a remote location, often with the ability to use speakers to alert people to the fact that they are being watched. This can prevent loitering, unwanted behaviour and even criminal damage and theft. If the security company also offers a key holding service, mobile security patrols or other services where they would be working on site rather than remotely, they may also be able to intervene if a security threat is detected on CCTV. This service will be more expensive but can offer an additional layer of protection, perhaps, especially, for vacant properties. CCTV monitoring is primarily a service that is used by businesses and it can improve security dramatically, helping to keep commercial buildings safe and deterring unwanted activity around the site.