TYCO SAFETY PRODUCTS DSC LC100PI DIGITAL PIR DETECTOR WITH PET IMMUNITY, Pet Immunity up to 55 pounds The LC-100-PI (Form A contact) detectors feature intelligent signal analysis for reliable detection, pet immunity up to 55 lb (25 kg) and am slim design that complements any dcor. Quad Linear Imaging Technology for sharp analysis of body dimensions and differentiation from backgrounds and pets Compact design for residential installations Advanced ASIC-based electronics