Cambridgeshire police and the countys trading standards have issued a warning and advice to residents following concerns about a security company offering alarm systems in the area. Officers said in some cases the person has refused to give company details and falsely claimed to be connected to the police. Two recent reports were from residents in Ellington, although other incidents may not have been reported. The sales techniques being used include: Offering a system for free or discounted following a call to the manager. Pressure to sign up straight away in order to get a good deal. Remaining in a persons home for two to three hours in order to wear them down.Crime reduction officer Rachel Carr said: If, during a visit to your property, a trader refuses to leave, contact the police immediately and make a note of the time of the request and the time the trader leaves. Initial costs outlined are misleading and do not reflect the true cost of owning a system, when yearly maintenance and monitoring are included. When buying an alarm system it is always advisable to get at least three quotes, and look for companies that are accredited by NSI (National Security Inspectorate) or SSIAB (Security Systems & Alarm Inspection Board). If you have been contacted by the company and feel concerned contact the police or Cambridgeshire Trading Standards for assistance. INFORMATION: Contact police on 0345 4564564, or trading standards on 08454 040506.