Product DescriptionMaterial: PCBDimensions: 11.99 x 8 x 2.01 cmPower supply: DC5V to 20VColor: White+BlueQuantity: 3 piecesPackaging content: 3 * infrared sensors1. How to use the HC-SR501 PIR body infrared sensor module, where the PIR motion sensor has a jumper for dual mode operation. It can be used in conjunction with any SOC, MCU, or even work independently to build fast moving activated lights, cameras, or w/e.2. Quality: The PIR motion sensor is a more energy-efficient and environmentally friendly human body detector module with high quality, high efficiency, low heat generation, and long service life.3. Smooth operation These are adjustable motion sensors, and there are small useful potentiometers/potentiometers on board to adjust timing and sensitivity. They work well and can run without a library.4. Fully automatic sensing should input a high level when someone enters its sensing range. When someone leaves the sensing range, it will automatically delay and turn off the high level. Output low level.