POLICE and trading standards officers are warning residents to be on their guard against unsolicited calls from companies selling alarms.

They say that representatives from the firms claim that the police will not respond to an ordinary alarm, but that their system will guarantee a response.

There are also concerns over the cost of the systems, which are priced at more than £2,000, when a standard domestic system usually costs a few hundred pounds.

PC Steven Drabik, crime prevention officer for Langbaurgh District of Cleveland Police, said: "In recent months I have received numerous calls from concerned householders after they have had unsolicited telephone calls from these companies.

"Their sales technique is misleading and intended to prey on vulnerable people.

"The offer of a big reduction for next-day installation should act as a warning.

"When purchasing alarms, always use a company that is registered with a trade association such as Nacoss or SSAIB."

Deborah Holmes, of Redcar and Cleveland Borough Council's trading standards department, said: "If you did not invite the seller to call, you generally have seven days to change your mind and cancel the contract. The seller must give you written details of this right to cancel.

"We are monitoring the activities of these companies and are interested in hearing from anybody who has experienced difficulties."

He added: "Alarms are only one aspect of security and people should consider additional locks, improved lighting and Neighbourhood Watch.

"Local authorities and major housing providers also offer a Homecall Service, which uses wardens to answer calls."

For further information, call PC Drabik on (01642) 302071 or Ms Holmes on (01642) 771204.