Need help with Kenneth Cole Reaction Wat...

I got this watch off eBay, brand new, but didn't come with a manual/instructions. Apparently Kenneth Cole's Website doesn't have downloadable instruction manuals. I can pull the crown out and adjust the time (and with many, many turns - the date as well) but there is a button above the crown that looks like you could stick a pen tip into that may serve some function - anyone know what this does or if it can help set the time/date in a quicker fashion? Thanks.