Two major weaknesses: No on / off switch, the thing is permanently on (only needs power when you click, but in the bag that thing therefore permanently switched on). Someone has not really thought along. And just for the mobile presentation is a pity that you absolutely need the dongle, although one with Bluetooth 4 can connect easily with the PC the Presenter. Even installed drivers etc. But the thing does not do anything ...
Battery and microUSB for charging would not be quite so bad. The price is not always so low.
So, good approach, unfortunately, some given away. Buy recommendation: Well, not for large screen so, but otherwise rather. Buy again? Rather no, wait. Until then, use PowerPoint in the Presenter presentation.