Passive infrared sensor with pet-immunity. Selectable immunity for animals weighing up to 36Kg, compliance to TS EN50131-2-2 Grade 2, Class II. Dual Protocol for compatibility with Galaxy Dimension and G2 systems, Le Sucre™ and Domonial systems. 11M x 12M detection Range. Selectable Pet Immunity (0, 18 or 36Kg). Patented Look-down Mirror. Front & Rear Tampers. Dual Protocol for compatibility with Galaxy Dimension and G2 systems and Domonial systems. Battery Life: >4.5 yrs Domonial, >3 yrs Galaxy. 10 minute Auto test with active LED. Advanced Dual Slope Temperature Compensation. Selectable Pulse Count and Sensitivity. Bi-Directional RF communications. Stylish and practical housing design. Operating Temperature -10° C to 55° C. 112 x 60 x 40mm.