By adding an additional surface/diver cable and underwater unit, the Alpha Pro X-DIVERS may communicate with two divers at the same time. It is also possible for the surface to switch between each of the divers. Possible configurations:
-surface/diver 1/diver 2.
If the unit is set for surface/diver 1/diver 2, the two divers would also be able to communicate with each other.