This sensor allow you to detect if a human has moved in or out of the sensor range. They are small, inexpensive, low-power and easy to use. PIRs are basically made of a pyroelectric sensor which can detect levels of infrared radiation. Everything emits some low level radiation and the hotter something is, the more radiation is emitted. You can adjust sensitivity, time delay and mode.
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When the jumper is in H position (see photo), OUT turns high when something is detected and stays high for X seconds.
When the jumper is in L position (see photo), OUT turns high while something is detected. When nothing is detected it turns low after X seconds.
You can adjust X in both cases with the Delay Time Adjust potenciometer (see photo). Clockwise increases time.
You can adjust sensitivity with the Distance Adjust potenciometer (see photo). Clockwise makes it more sensitive.