SNS-IR-3-80 is adjustable infrared proximity switch. It operates with 5V and hence can be directly connected to Arduino. The power consumption is 50mA. The output is NPN open collector with load capacity up to 100mA.
SNS-IR-3-80 can be adjusted to detect objects from 3 to 80 cm, perfect for robots obstracle detection or for counting items on production conveyor. You can use it in your hidden security alarm also if build in door frame, it will detect if person pass through the door frame. IR light is invisible, so nobody will see the IR fence.