Features: Form 'A' alarm contact and tamper switch. Digital signal analysis. Slim profile design. Features ABS plastic for shock and impact protection. Exceptional white light immunity. Pet immunity up to 25 kg (55 lbs). Quad Linear Imaging Technology for sharp analysis of body dimensions and differentiation from backgrounds and pets. Advanced ASIC-based electronics. Compact design for residential installations. Adjustable variable pulse count. PIR sensitivity adjustment. Height installation calibration free.