I first laughed when I realised I had bought a bluetooth scale instead of just a digital one. I entertained the idea and downloaded the app. It actually worked really well without being a massive pain to use. You can also use this multiple times without you phone, and upon using the scale the next time with your phone, it syncs all the previous data to it. Nifty! The app even gives you a positive/negative 'ping' based on your goal and if you've gotten further/closer to it since you last weighed in!