GRANDSTREAM Networks GBX20 caller ID display Grey

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.Grandstream Networks GBX20. Product colour: Grey. Depth: 33.5 mm, Width: 124 mm, Height: 210 mm