The gbx20 is a backlit lcd extension module supported by the gxv3350 and grp2615. The module includes 20 dual-colored extension keys and 2 arrow keys for page switching allowing each gbx20 to support up to 40 contacts extensions. . Connect up to 4 gbx20 modules to compatible grandstream phones for a total of 160 contacts extensions.
The gbx20 is a backlit lcd extension module supported by the gxv3350 and grp2615. The module includes 20 dual-colored extension keys and 2 arrow keys
