Now for the R400:
The R400 is with its pear-like shape comfortable to hold and is also relatively inconspicuous. He has 5 controls (forward / backward / off screen black & restart cancel / presentation / Laser Pointer). The buttons are useful and well positioned to reach if you hold the Presenter normal in hand. In addition, the arrangement and shape of the keys ensures that you can feel in the dark which key is pressed just.
The receiver can be stowed in the Presenter and was recognized with me until now from any PC right away. The laser pointer is red, but has enough power and is therefore clearly visible.
With just over 30 also agrees the value for money, so I would buy this Presenter at any time.