This sensor detects changes in the or even tiny movements within its detection range. and High Quality. The microwave sensor is an active sensor, and the HF sensor emits high frequency electromagnetic waves (5.8 GHz) and receives their echoes. The microprocessor triggers the "lights up" . Signals passing through the door, glass plates and thin walls may be detected. This product is a moving object sensor with a detection range of 360 degrees and an operating frequency of 5.8 GHz., Manufacturer: Akfldms