Paradox Dual Wireless IR Perimeter Motion Detector. Dual zone. For sliding doors and windows (external and internal), with anti-masking and pet immunity. Compact dimensions: 12 x 6 x 4.3 cm. For protecting windows, doors or fences. Narrow beam of 0.5–2 m, depending on the selected mode. 433–868 MHz. Anti-masking; requires detection by both PIR sensors to trigger the alarm. High resistance to false alarms; pet immunity up to 50 cm; EN 50131-2-2 Grade 2 certified.