Mobile Bug Detector This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one and a half meters. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of mobile phone for spying and unauthorized video transmission. The circuit can detect both the incoming and outgoing calls, SMS and Video transmission even if the mobile phone is kept in the silent mode.