This Substation can call the Master by pressing the Call button. A
tone will sound as long as the Call button is pressed. Once the Master
responds, the Substation can then talk hands free and the Master station
operator will need to press the Talk button to reply.
Only two conductor wiring is needed from a Substation to the Master.
Substations cannot share a wire with each other.
No additional power supply is required to add more substations.