Geeetech Infrared proximity switch module compatible with Arduino/Iduino

The infared proximity switch module is a reflection-type photoelectric sensor which integrates transmitting and receiving infared beams function. Infrared proximity switches work by sending out beams of invisible infrared light. A photodetector on the proximity switch detects any reflections of this light. These reflections allow infrared proximity switches to determine whether there is an object nearby.
technical parametersVoltage :DC 5V
Current :100mA
Type :DC 3 Wire NPN-NO (Normal Open)
Sensory Distance: 3-80 cm adjustable
Sensory distance regulator and output indicator
light on product back
Control signal level:
Highïš2.3V‰¤Vin‰¤5V
Lowïš-0.3V‰¤Vin‰¤1.5V