The CRSUK unit has better performance than you specify - yes, it's simple enough to run on AAs but, being switched on and off as a spotter and range finder, it lasts a lot longer than 2hrs and, the inbuilt IR is perfectly capable for further than airgun ranges.
And, although it's a little boxy, it sits nicely in the pocket of an army surplus smock or the leg pocket on cargo pants.
The hand strap on the side means that it can be operated with one hand - it sits securely in your palm and, the buttons on the top are easily reached by your fingers.
It doesn't do all th