This is an Ipevo P2V (point to view). It is about the size of a water bottle and can perform all the functions that bigger, clunkier versions do while being easily transportable. This chapter will cover ways in which these handy tools can be used in teaching situations.
Here are some videos and quotes on how others use document cameras. Though these focus on the elementary level, you can do many of the same things with more advanced content in the upper levels.