Overview D203S is the hot selling item in the market. Mostly used for light control lamp switch, general detection angle. PIR (Passive Infrared Detector) are used to detect motion object like human movement. All the PIR sensor must work with Fresnel Lens, this version can detetc more than 8 meters. Features Low consumption Custom design is available Higher in cost-performance Item D203S Encapsulation Type TO-5 IR Receiving Electrode 21mm, 2 elements Window Size 3-4mm Spectral Response 5-14m Transmittance 75% Output Signal[Vp-p] 3500mV Sensitivity 3300V/W Detectivity (D*) 1.4 108 cmHz1/2/W Noise[Vp-p]