The OPB609 consists of an 940 nm, Light Emitting Diode (LED) and an NPN silicon Phototransistor, which are mounted "side-by-side" on parallel axes in a black opaque plastic housing. This unfocused reflective object sensor is ideal for detection of diffuse materials such as paper, labels, or anything with a matte finish. Custom electrical, wire and cabling and connectors are available. Contact your local representative or OPTEK for more information.