Additional handsets (up to total of 4 max per intercom, which can be
a mix and match of both styles.)
603-EH
Additional handsets (up to total of 4 max per intercom, which can be
a mix and match of both styles.) Can be wall or desk mounted.
603-HF-EH
Range boosting antenna which can be added to transmitter at gate
and also optionally to the handsfree monitor type. One antenna can
boost range by 30%. Comes with 2 metre antenna cable
(RG174 with SMA male connector).
603-WIFIA