When the body is near,it will automatically start the alarm,The highest sensitivity in the range of 4-5 meters Put or paste the alarm in a certain height, within 5 meters within the angular range 120 degrees left and right, as long as people or animals, swaying back and forth in a very short time, induction starts. Monitoring and Interception - After turning on, it can be connected by communication tools. And waiting for a few seconds after through, you can hear clearly the situation 15 meters area around. Operation frequency:850MHZ,900MHZ,1800MHZ,1900MHZ Working current:below 10mA Idle current:below 0.05mA Voltage:AC100-240V Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Colour:Black Material:plastic Package Contents: 1 * Mini GSM Motion Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.