what more can I say - it ' a a MagLite & it work in Sub-Zero Deg f - -rrb- `` no surprise '' . a few suggestion for the unknow on the use of the mode : full power : for distance work - full saturation 25 % power : use during reading ; close work not blind by surface reflection ; extend usage Strobe : Beacon for warn or attention when use color lens -lrb- optional -rrb- ; search & rescue locator SOS : Beacon for search & rescue locator finally , later model tail cap permit a lanyard to be attach . why MagLite put out the earlier led model with the `` FLAT Tail Cap '' be beyond I .