I have had one of these for about 3 months I think
And I must say it's one of my all time favorite lights, I use mine by way on peracord necklace.
Really simple twist on twist off operation and being powered by a D battery mean it is ready when I am, I usually run the 2nd light mode because the first is too bright for close up work
It's slightly bigger than the d battery inside it, and it's about 1.5x the length of the battery.
Thanks for looking , I truly love this light as a pack light