Keeps the transmitter a short distance from the tank handle when carrying. The Scubapro 10cm High Pressure Hose is a short high pressure hose that is used to connect a transmitter on to the 1st of your regulator.
This allows the transmitter to hang down to keep out of the way. Many divers pick up gear via the 1st stage and when a transmitter is connect, it can damage the connection. When a short hose is connected, this eliminates any damage. When you purchase a transmitter, you generally get a spool which sits between the transmitter and the hose. You can purchase these seperately.