Vertical SBX 48-Button Expansion Console
Vertical 48-Button Digital Expansion Console
The 48-button digital console for the Vertical SBX. Add this expansion module to any Vertical SBX 8-button digital telephone (4008-00) or any Vertical 24-button telephone (4024-00). Adding the expansion module will allow you to have more programmable buttons available for one-touch dialing and busy lamp appearances for other extensions on the system.