An alarm monitoring center or central-station is a company that provides services to monitor burglar, fire and residential alarm systems. The central-station may also provide watchman and supervisory services.Central-stations use special telephone lines, computers, software and trained staff to monitor their customers’ security systems and call the appropriate authorities in the event an alarm signal is received. Typically, there is a fee for services rendered. Because quality and experience can vary greatly among alarm companies, prospective customers are well advised to do their own research before making a final choice. Not all alarm companies monitor the systems they install and may outsource these services to another company.