GSM signal detector with an alarm and flashing lights   (ID: BD08)

With this ma detector you can tell when someone is using a mobile phone.I it detects the presence of broadcasting in each of the four ranges used by the mobile operators - GSM, DCS, CDMA and 3G. Each of the bands has a smooth span using potentiometer. When someone tries to use the cell phone of one of the frequency bands this will trigger powerful sound and light alarm.