The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Immersive Applications:
Finally there is a solution to endless office debates about where to get lunch. What's For Lunch takes all the difficulty out of deciding where to get food.This app is powered by Yelp and provides the ability to randomly select a restaurant located within 25 miles. Either press the button or shake your phone to select where you will eat.