Two mountain troopers (Gebirgsjäger) operate a Lichtsprechgerät 80 on a hillside.



The same two soldiers communicate through modulated light that becomes voice.



Men of the same mountain troop.



The soldier on the left is adjusting the aim of the Li.Spr. 80, to improve communications for the man on the right.



The "Kaserne" where these men live.



A campuflaged Li. Spr. 80 in the forest.



And at the other end, we see the same two friends.