This PVS-14 use 11769 style tubes. 11769 tubes have a gain lead off of the tube for manual gain. This is a huge benefit when moving between varying lighting conditions as the brightness can be adjusted to the desired level.
 
L3 Unfilmed White Phosphor
 
High FOM - 2376
 
 
 
Battery
One Standard AA Battery (not included)
Deminsions
4.5″(L) x 2.0″(W) x 2.25″(H)
Battery Life
Approx. 50 hours