Maintaining your home's security is important, but many people believe that motion sensors will be triggered by the family pet and therefore ignore this important element of a security system. This isn't the case with pet-immune motion sensors like the DSC Pet-Immune PIR Motion Sensor, which automatically rejects single or multiple pets weighing up to 60 pounds. The DSC Pet-Immune PIR Motion Sensor connects to your security system (sold separately), sending an alert upon sensing motion Specifically designed to provide optimal performance while preventing false alarms in environments containing pets, the DSC Pet-Immune PIR Motion Sensor uses digital technology, a microprocessor, multi-level signal processing, dual operating parameters, automatic temperature compensation and a unique pet rejection lens to provide effective and reliable detection of human motion and good protection against nuisance alarm associated with pets weighing up to 60 pounds. The detector also provides excellent immunity to such false alarm producing influences as RF, static and electrical transient. Mounting screws are sold separately. Connect the DSC Pet-Immune PIR Motion Sensor to a listed power supply (sold separately) providing at least 4 hours of standby power.