Bike computer instructions are notoriously difficult to read. I think part of the problem (at least with the Cateye comps that I have) is that they are trying to include on one piece of paper instructions that can be used in all countries. My new Cateye Micro has two of them. One is a really hard to follow flowchart with mostly pictograms and the other is tiny text instructions unreadable by any eyes over 40. I did download a user guide from their web site, however, and it was very different from what was included with the box and much easier to follow.