Here is another AWS IoT Button project that takes less than 1 hour to complete. The idea is to long-press the button and it will ring your phone, in other words, find your phone. This can be accomplished by using a service called Twilio, which allows you to make phone calls, send text messages, etc.
See the tutorial & source code here on my GitHub.
P.S. Apparently, Amazon has launched the second generation of the button, which doubles the battery life to 2000 clicks.