Premium wrist blood pressure monitor with on-screen instructions, Microlife Averaging Mode technology and PC Link Blood Pressure Analyzer Software with USB port and cable. Microlife Averaging Mode feature takes three consecutive measurements and averages the results for advanced accuracy, 30 Memories for two users (30 each/60 total), Five year warranty, One button operation, Large one button operation System requirements for Blood Pressure Analyzer Software: Windows 98 SE, 2000, XP or higher CD-Rom Drive (tray loading) Minimum 256MB RAM 500MB Available Hard Disk Space USB Port Version 1.0 or Higher