RK308 Dual Sensor Curtain Motion Detector has been Designed Special for Residential Environments. It has Strong Ability to Catch Signal and the False & Lost Alarm Rate is Low. Low Power Consumption and True Temperature Compensation. High Technology and Smart Manufacture and Elegant Appearance. Stable Performance and Long Use Life. Special Lenses Design for Full Orientation. Equipped with RA93 Swivel Bracket for Easy Wall or Ceiling Mounting.