Central Circuit Televisions (CCTVs) are cameras that record live activity and play this activity on a television, while recording at the same time. Stores, malls and city officials usually have these installed in order to monitor he general public and look out for any trouble makers.  
Having CCTV installed in your shop or offices is a very good idea and it will come in handy of there is a problem such as a robbery. With the camera, you will be able to have a visual of the culprits and the police will have a face to look out for in their investigations. In addition, if there are any crowd problems, during street protests for example, the police can take a look at the CCTV footage of the streets and identify suspects.
There are a number of professionals that install CCTV cameras in any premises, including the street. They have the expertise to make sure that the cameras, televisions and recorders are all working properly. These cameras are useful for those that want to keep an eye on the floor, especially in casinos. In casinos, the security team needs to keep a close eye on the patrons visiting the casino.
If there is a problem with the CCTV system such as the fact that it is not recording or it is failing to give feed to the television, a repairman can be contacted. It is usually a good idea to get the people that installed the CCTV system to come in and repair it. This is because they have a better knowledge of your premises and of the information on how the system was installed.  
If, for whatever reason, you cannot get hold of the original installers, then an experienced repair company will be a good alternative. They have intimate knowledge of CCTV systems and how they work in general. This way you will be ensured that you are paying good money for very good service. You can search the internet for a repair company that is in your area and be able to take a look at the services that they offer.