A signalling device and communications system

摘要: Provided is an emergency signalling device (10) and system (100) by which signals are transmitted for reception authority when a user set time the transmission elapses without cancellation or reset. The may be telephone beacon. In example digital mobile phone messaging using terrestrial and/or satellite based radio communications wherein in form of short service (SMS) capable transceiver automatically transmits distress signal addressed to search rescue (SAR) organisation within preset interval event incapacitation user.