Grandstream GBX20 20-Button Extension Module (GBX20) Refurbished
The Grandstream GBX20 is a backlit LCD extension module supported by the GXV3350, GXV3450, GRP2615 and GRP2624. 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.
