I lost my Fitbit flex three days ago. I was so so sad and angry at myself-I didnt notice it was missing for a day and a half...that shows how much I checked my Fitbit app but thats beside the point. I looked everywhere in my house, at my mothers house, I called the stores I shopped in the day it went missing but I got nothing. I finally figured Id spend the $5.99 to purchase this app to see if it could help me. It my last resort. So I bought it, loaded it walked around my house and within 10 minutes the app started chirping and buzzing and the HOT fire status appeared--my Fitbit was found deep underneath the kitchen counter in a massive Costco sized oatmeal box!! Really? I wouldve never found it-- it wouldve taken me a whole year probably to eat up that oatmeal and come across it and by then the battery wouldve been dead and I wouldve been totally out of luck!! I wouldve purchased another Fitbit and wasted my money!! If youve lost your Fitbit BUY THIS APP!! I give it 10 stars!!!!!! Im so happy happy happy! And so is my husband because he gave it to me for Christmas!