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 Fernn Rojas-Echenique:
Look For Friends provides an easy way for your friends to find you in a crowd! This app makes your iPhone screen a specific color so friends can identify you in crowds of people. Simply text a friend your color and hold your phone up high so they can spot you from far away. Look For Friends works best at night or in low light conditions where clothing and other indicators are harder to spot. IFF is also great for concerts, sporting events, and meeting friends in crowded public spaces. Happy hunting!