Signalling Devices are an important aspect of any safety management system such as Dam Safety System, Earthquake Warning System, Fire alarm system and Defence warning systems and others. They have an important role of signalling the target about the change in parameters. Safety is of primary concern in any hazardous industrial environment. Leakage of inflammable gases is one of the biggest issues in mining and petroleum industry. These environments generally present additional challenges such as vast area to signal and a lot of noise to overcome. Signalling devices designed specifically for this purpose generally have several additional features such as being explosion proof and fire proof.