This is the improved Ghost Detector Sensor Array. This Ghost Detector Array is a set of six sensors that can be used as a stand alone “Ghost” Detector. This kit contains 6 ultra-sensitive EMF Detector that can be used in your Paranormal investigations. You will be amazed at what these devices can detect. With some experimenting, you can discover when and where to place these Ghost Detectors for the best results. These are small enough that you can place them almost anywhere. The LED will come on as long as it detects a presence. It can come on briefly or stay lit longer, depending on the electrical fields in the area. You will get 6 built & tested devices. Each detector will require one 9v Battery; there are no batteries included with this kit. These are also offered in sets of 15 for even greater savings.