Qunqi 10pack HC-SR501 Pyroelectric Infrared PIR Motion Sensor Modules for Microcontrollers automatic sensor:when enter the sensor,output range is high,when people leave the sensor, range of the automatic off, output low temperature compensation,Blockade time: 0.25 seconds two trigger mode:not repeat the trigger, repeatable trigger Operating voltage range: DC 4.5-20V Quiescent Current:50uA Trigger: L can not be repeated trigger/H can be repeated trigger(Default repeated trigger) Operating voltage range: DC 4.5-20V Quiescent Current: &lt;50uA 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 Angle Sensor: &lt;100  cone angle Lens size sensor:Diameter:23mm(Default) Security Products the human body sensors toys the human body sensor lighting industrial automation and control, etc It can automatically and quickly open various types of incandescent, fluorescent lamps, buzzer, automatic doors, electric fans,automatic washing machine and dryer Machines and other devices,is a hightech products. Especially suitable for enterprises, hotels, shopping malls, warehouses and family aisles, corridors and other sensitive Sense of region, or for the security zone automatic lighting, lighting and alarm systems