The CNY70 is a small device with form of bucket and four ducklings that lodges in its interior a diode transmitter of infrared that works to a length of wave of 950 nm. and a fototransistor (receiver) being both arranged in parallel and aiming both in the same direction.
The distance between transmitter and receiver is of 2.8 mm. and they are separated of the front to the encapsulate for 1 mm.