I lost my Fitbit Charge in my home. After reading reviews I figured it would be worth the $5 for the app to possibly recover my Charge. I never got a signal, ping or anything. I later found my Charge in my spare bedroom. I tried using the app from my iPhone with the Fitbit on my wrist. No signal. Nothing. Very disappointed but thankful I found my Charge.
Cristee35 about Fitbit Finder - lost Fitbit