This is a PIR motion sensor, which is based on infrared technology, use in automatic control products. It can be used to detect motion from pets/humans from about 6 meters. It has an adjustable delay before firing (approx 2-4 seconds), adjustable sensitivity.
Input voltage: DC 4.8~20V
Static current: 50uA
Output signal: LOW: 0V, HIGHT: 3.3V (Output high when motion detected)