If you just happen to misplace the USB receiver, or break it or simply just forget the receiver in the last PC you presented... Well, you will find out that in places such as Australia you cannot get the little spare part.. Given that this item is so easy to be lost, I found this oversight from Logitech to be very annoying. I would like to have a couple of spare USB receivers so I don't have to worry about loosing them. Too hard, I'll have to contact the USA guys and see if that can be arranged from there. Or just get another, cheaper brand and forget about the Presenter all together. So if you use it in many places chances are that you will, sooner or latter, have a useless presenter.