PREMIUM MATERIAL: This single beam photodetector is made of high quality plastic housing, which is eco-friendly, durable and sturdy10m IR Detector: This photoelectric IR detector can produce a reliable and invisible IR beam up to 10mWide Application: This photoelectric beam sensor alarm is widely used in daily life and can be installed in security systems such as schools, office buildings, hospitals, home yards, etc.EASY INSTALLATION: The half-egg shape can be easily and quickly installed on the wall or door, keeping you safeNote: The range can be reduced to 30% in bad weather conditions: fog, rain, dust, etc.Note, because there may be color and size differences between the light effect photos and the actual product, please allow 1-2 cm errorQuantity: (1 set) Infrared alarm (other products are not included)Size: As shown (for reference only)Color as shown