RK410PT Adopts the VPT Technology, RK410PT Dual Sensor Motion Detector With Pet Immunity could Effectively Recognize Intruders and Pets. The Ability of Pet Immunity Alarm is up to 701b(33kg) Dog, 4 Cats or Corresponding Animals. It's Designed Special for Residential Installation. It has Strong Ability to Catch Signal, Low False & lost Alarm Rate, Low Power Consumption and True Temperature Compensation. Smart Manufacture and Elegant Appearance. Stable Performance and Long Usage Life. Proper to both Wall and Ceiling Mounting. Easy to Design and Install by being equipped With RA93 Swivel Bracket.