... of SMS Alarm 3.Intelligent Terminal Human Motion sensorMicrowave Detector with high penetration.It adopts advanced rigorous monitoring arithmeticit ... vile circumstances of smoke, dust, vapor, chemical atmosphere,and high or low temperature,easy reliable installation, reliable and stable ... X 5.5cm X 2.3cmPlease enjoy our demo show:http://www.youtube.com/watch?v=BAXURPn4d48 Human Motion sensor alarm