SunFounder HC-SR501 Human Sensor Module Pyroelectric Infrared for Arduino UNO R3 Mega 2560 Nano Product Type: HC--SR501 Body Sensor Module Trigger: L can not be repeated trigger/H can be repeated trigger(Default repeated trigger) Delay time: 5-200S(adjustable) the range is (0.xx second to tens of second) Block time: 2.5S(default)Can be made a range(0.xx to tens of seconds) Board Dimensions: 32mm*24mm