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This review is from: Kensington Wireless 2.4 GHz USB Presenter and Red Laser Pointer - Compatible with PowerPoint and KeyNote (Office Product)
This works fine if you are scrolling down a list of photos etc within a single file. However, if you wish to scroll down a list of files to open, it jumps from the top first one down to the bottom one missing out the ones in-between. I subsequently bought a remote keyboard and mouse and for my presentations this was a better choice. However, if you just want to use this for selecting within a single file this is fine and I like the red laser pointer which stores in the unit when not in use.