This explains the teleport mechanic. You need 1 dynamic object (say the box).
You fire your blue beacon at it. The blue beacon arcs when it travels (doesn't travel in a straight line), and it has a physical weight. You can fire as many blue beacons as you want.
If the blue beacon hits a dynamic object, that object will become marked, and will start to glow blue. If the blue beacon hits a wall, or a non-dynamic object, nothing will be marked. You can only have one object marked at a time. So if you mark a second object, the first mark will disappear.
Now, with your object marked, no matter where you are, you can teleport back to it (on top of it to be precise). So you can use it to get to places you cant reach, go back to previous places, and most importantly, you can create temporary save points before a difficult jump or trap or enemy.