1pcs Pyroelectric Infrared PIR Motion Sensor Detector Module HC-SR501 PCB Dimensions: Approx. 32 x 24mm Operating voltage: DC5V to 20V Level output: 3.3V, low 0V Delay time: adjustable (0.3 seconds to 18 seconds) Package Content:1 x Pyroelectric Infrared PIR Motion Sensor Detector Module