Improvements relating to security and electronic article surveillance

Abstract From the Canadian patent

There is disclosed a security device, a security system and a method of providing security in a retail environment or the like. Shopping trolleys associated with the retail environment are fitted with security devices having a receive-only wireless receiver and a processor the receiver receiving , wireless signals transmitted from one or more transmitters located at various locations around the retail environment. By analysing the wireless signals as it passes thereby, the processor of the security device can determine a location and/or a direction of travel of a shopping trolley to which it is fitted. In addition, an alarm signal may be raised if a predetermined signal or sequence …