Paradox Wireless Bidirectional PIR Detector – Compact, Dual-element, Single-lens, for indoor use, Grey, Grade 2, for Paradox M systems. Multiple processing modes, ultra-quiet detection beam. For Paradox M systems, GFSK technology with frequency hopping and encryption. Integrated mounting bracket. Temperature sensor, includes 1 CR123 lithium battery (6 years). Certifications: CE, EN 50131-2-2, sensitivity and detection power control