Motion Detector with Pet Immunity is a compact detector which has been designed for residential installation and has features such as strong ability to catch signal, false and lost alarm is low, low power consumption and true temperature compensation. The Detector comes equipped with pigmented optical lenses to resist the interference of white light and has detective range of 10 m. The Detector can prevent the false alarm being caused by the dog of 20kg, 2 cats or other rodents and dual polarity pulse count is adjustable. The Detector can resist interference of white light, can be installed on wall, ceiling or corner mounting and pulse count is selectable. The Detector requires working voltage from 9 to 16 VDC, working current of 12 mA and requires 2 minutes warm-up time. The Motion Detector with Pet Immunity has dimension of 89 X 52 X 39 mm, installation height of 2 M.