No idea, but had a similar 'how do you' question with my (very old) Cateye Tomo this morning. Googled the model name and number, and full page of Cateye instructions were displayed. Try this - http://www.cateye.com/sites/cateye/upload/manuals/en/VL500.pdf
I think you press the reset on the back AND hold the button on the front at the same time. Maybe for a good few seconds. I've done it, I just can't remember how!
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