MOBi-lert Pendants (PTX) are wireless personal transmitters worn by every person on board the vessel. Supplied with clips and lanyards, pendants are included with every MOBi-lert system. Users simply attach the waterproof Pendant to their clothes or body, using the supplied lanyard or belt clip. Each Pendant is continually transmitting signals to a central receiver installed on board the wearer's vessel. Any break in transmission between a wearer's Pendant and the vessel, (caused by going out of range, or immersion in sea water), will raise an alarm. PTX are available in a range of colours. They are small, lightweight and very easy to wear.