Many features, but the directional pad could be what faster

enclosed my review of the product. I uploaded photos and a video still follows.
That's why I consider myself now times short.

Compared I had the 104, 180 and 109 model.
The 104 has a scroll laser pointer and a button for forward / back. In this 2x AAA batteries come in. The USB receiver is separately.
The 180 also has these features (and the same batteries), but additionally a trackball means that you can control the mouse pointer.
If you push the ball, it has the left mouse button function. The R button on the presenter presents as the right mouse button. The USB receiver is very small and hidden in the device.
The 109 has the same functions as the 104 and 180. However, these come in a different battery in and the USB receiver (the device hidden) is slightly larger than that of the 180th
The cursor is controlled by directional pad, which does not unfortunately goes as fast as the trackball. There is an off / on, and M1 and M2 mode. M1 and M2 for PowerPoint to start, pause or stop for eg videos or MP3. According to up / down, you can also make.

All Presenter features loosely over a distance of 6 meters.

Me personally the 180 particularly liked. But everyone must decide for himself what he buys. You need only one for PP, one wants to navigate the cursor around the screen, or even listen to video / Mp3 located.

Greeting Micha