The V-2926 Option Board provides enhancement features for the V-2924A Flexible Architectural Number Plan PC Compatible Programming Port with Windows Based Programming Tool Enhanced Caller ID Real Time Internal Clock For Printer Output Secondary Serial Port User Defined Page Groups; Computer Requirements: Hardware : 80486 (higher is recommended) Hard drive with 20 Mbytes free Mouse 8 Mbytes of RAM (more is recommended). Software: MS WindowsTM 95 MS WindowsTM 98 and MS WindowsTM NT; Shipping Weight: 3.5 lbs (1.56 kg)