I have a suggestion from my friend that why don`t we use remote control to make our presentation better? Actually, it's a very very old method to use. Many people use it when they are in class, company or anywhere, and I'm just an old-fashion follower. In general, people used a remote control that was especially designed for (of course) remote control. However, now they don't need to bring that device together with their stuffs because of the raise of smartphone these days. It's the time for utilizing it.
Let's imagine that how cool you are when standing in a class with your phone using as remote control to help to change your slides seamlessly. To do this, you can search such these apps in the market with such the "remote control" key words (both Android and iOS). I guarantee that you will file a bunch of them. Most of them are useful if you know how to use it properly. In my case, I prefer
PresenationApp (don't worry about the Korean, it has English version) because it can helps to control not only the PowerPoint slide but also the mouse of the computer.
What you should notice is that your phone and computer must in the same network subnet for communicating. If not, use Bluetooth option.
Have fun!
(Thanks Jay for this recommendation)