1,Sensor size: 1/4" 2,Wavelength: 650mm 3,Focal length: 2.5mm 4,F/NO: 2.5 5 ... high quality photosensitive resistance,metal photosensitive resistance,photosensitive sensor,fresnel lens and optical coating lens......Our ... Purchasing in both domestic market and overseas market.4) OANDE guarantees you quicker and better service ...