Tap Features:

Double Tap 6 to Unlock Tap Functions / Single Tap to Lock tap functions.
Tap Centre to Zoom. Barely
Between 1 & 2 to Start/Pause/Stopwatch – double tap to Reset.
3 to adjust Brightness.
9 toggle Dim – Auto / On / Off.
Between 10 & 11 to park hands  / Tap again to reset.
12 to toggleFaces.
Second Hand Battery Reserve in Dim.