You need to find someone in a crowd, why not use your smartphone as a beacon.
Just agree upon a color in advance and hold your phone up in the crowd with
one of these flashing colors so your friends can locate you.
NEW: Download the (FREE, advertisement free) Android App!
In the app you can also hold down on the flashing to make the phone go all white to further customize your signaling.
See also our Comedy Audio Dashboard perfect for
virtual open mics.
This is in beta, feel free to send feedback.