Together with my LK I picked this pen as a gift for our teachers, since many functions are connected in one. First there is the illusion that it is "only" a laser pointer is. Think again! The other end can be pulled out to a telescopic pole, which is a stylus for capacitive touch screens on the cap. The pin at the top can be removed by screwing the cap (What I see a problem, since the cap can be lost) bring to the fore. As an all-in-one tool is very convenient for our teachers as a doctorate in physics.