Description :  KERUI P821 Wireless PIR Infrared Curtain Detector Sensor 433MHz for Home Security Alarm System   Specification :   Flexible and simple to install for basic security applications. Working Voltage: DC3V (2 "AA" battery) (Batteries Includes.) Static Current: Less than 25 uA Alarm Current: Less than 10 mA Detection Range: Adjustable (2 meters、 4 meters、 9 meters three gears) Detection Angle: 15 degrees Self-check Time: About 30s Warning Prompt: Red LED Low Pressure Instructions: Yellow LED Working Temperature: -10\u2103 to 50 \u2103 Humidity: Maximum: 95% RH (no condensation phenomenon) Installation Height: 1.7 to 2.5 meters Launch Frequency: 433 MHz Launch Distance: Open distance not less than 200 meters Overall Size: 110 mm x 69.5 mm x 40 mm   Package includeds :  1 x KERUI P821 Wireless PIR Curtain Detector 2 x AA Battery 1 x Set of Installation Accessories 1 x User Manual   Details pictures :