The 6021N features:

Measures systolic, diastolic pressure, and pulse
British Hypertension Society (BHS) AA rating ensures unrivaled accuracy
Smart Logic™ Technology determines ideal inflation level
Irregular Heartbeat detector
Automatic inflation and deflation control
Recalls last 99 readings with date and time stamp for two users
Self-adjusting extended range latex-free D-Bar cuff fits arm ranges from 8.7” to 16.5” (22 cm to 42 cm)
Auto-off
Not made with natural rubber latex
4 “AA” batteries included
Deluxe Storage case
Optional AC adapter (sold separately)
Meets or exceeds EN 1060-1, and EN 1060-3
5 Year Warranty