The 6016 features:

Measures systolic, diastolic pressure, and pulse
Smart Logic Technology determines ideal inflation level
Average mode automatically averages 3 readings for more meaningful results
Latex-free wrist cuff fits 5” to 7” wrists
Recalls last 90 readings
Auto off
Compact storage case.
Power source: 2 dry cells (Batteries) UM-4, size AAA, 1.5V