Option Card provides enhancement features for the V-2924A such as Enhance Caller ID, Programmable Dial Codes, User Defined Page Groups, Secondary Serial Port.- Time Sync Output.- Custom Page Groups.- Enhanced Caller ID.- Flexible Architectural Numbering Plan.- Interface To The PC Programming Tool.- Store User Data To EEROM Real Time Clock For SMDR Printer.- Auto Detect For Com, Port Or Modem.- Auto Adjust For Daylight Savings Time.- Evacuation Tone To Specified Groups.- Time Tones To Specified Groups Read.- Software/Firmware Revision Numbers.