Jumper Setting Modes in PIR motion sensor
If you move the jumper to L position the sensor will 'toggle' (change state) every time motion is detected - probably providing the on-board timer has timed out. This is unlikely to be of much use in a practical application. (Watch the comments for corrections!)

Moving the jumper to the H position will result in the more usual sensor logic. The sensor will turn on when motion is detected and turn off some time after the last motion is detected. This sensor will reset the timer (which would otherwise turn the output off) every time motion is detected and would be suitable, for example, for room occupancy lighting control where you don't want the lights to blink off while the unit resets.

Select the mode you want using the jumper and connect the output of the module (and ground and power) to your other circuitry to use the detector.