### Jack Nice Photocell Eyepiece: A Comprehensive Guide Photocell Eye Jack Nice Italy is an ideal choice for all types of parking jacks, including rail, arm, and curb. This photocell has NO and NC relay output, which provides wide applications. The operation of this device is such that if any object passes in front of it, when the door is opened or closed, the operation of the door stops. #### How the photocell works Optical or photocell is one of the vital components of automatic parking doors, which are usually installed on both sides of the parking entrance frame. The best installation height of this photocell is between 60 and 65 cm from the ground. The operation of this device is done by receiver (RX) and transmitter (TX) circuits. The infrared transmitter sends signals to the receiver, and if there is an obstacle and these signals are interrupted, the movement of the door stops immediately. This mechanism prevents possible collisions with passersby or cars.