I bought one of these last semester to use in my lectures and seminars. In my University many of the computers are often located at the side of the room where I don't want to be, and those that aren't are positioned directly in front of the projector. This means that as you change slides your head obscures the screen, and you periodically get blinded. I also like to wander around the room as I talk, and sometimes want to draw students' attention to particular parts of a Powerpoint presentation. All of this helps encourage interaction. This gadget makes all the movement possible without having to dart back to a fixed point all the time. You can control the slides from anywhere in a large lecture theatre, and use the pointer at will. It also has a useful control switch that allows you to switch back into 'mouse mode' in order to launch embedded video or audio, scroll around web pages and so on, and then switch back to slide mode. It works straight out of the packet, and doesn't require any technical knowledge at all. Note that the part of this product that looks like a flash drive is in fact just a dongle that has to be fitted to a USB drive on the computer. Your Powerpoint files have to be on a flash drive, or stored on the computer's hard drive. I have come across one or two lecturers who couldn't work out why their computer wouldn't recognize their new flash drive! This model also comes with a protective case, so you can just pop it into your bag and carry it around whenever you're teaching. It's now become 'standard kit' as far as I'm concerned, and is a great product for the price.