Designed around passive infrared detection technology, the HC-SR501 PIR motion sensor detects heat signatures emitted by human bodies and pets within its coverage zone. It features two onboard potentiometers to adjust sensitivity distance (up to 7 meters) and delay time (0.5 to 200 seconds). Additionally, a mode jumper allows selecting between repeatable and non-repeatable trigger modes. Perfect for intruder alarm systems, automatic motion-activated lighting control, and energy-saving smart home automation projects.