2pcs Automatic Infrared Beam Detector Ir Alarm Sensor Door Light Sensor Burglar Alarm System2Pcs Infrared Beam Detector Burglar Ir Alarm Sensor Automatic Door Light Sensor Alarm SystemFeaturesSingle beam infrared radiation: suitable for antitheft such as doors and windows, box, fence and so on. Small size, big effectSealed shell, stronger waterproof: Thanks to the good waterproof design, it can effectively cope with all kinds of bad weather, so that the internal components are not eroded by rainDetection distance 20m: Install to ensure that the emitter and the receiver are on the same horizontal lineStable and reliable antiinterference: using hemispherical optical lens, the beam is concentrated, precise and nonscattering, and the automatic strong light adjustment system can effectively avoid the interference of strong light and car headlightsSpecificationsLight source mode: infrared pulse typeDetection method: Beam interruption pickup typePackage Include:2Pcs X DoorbellNote:Due to different personal measurement methods, there will be an error of 24 cm, please understandThanks for your support