The could prove to be a valuable product after all. Well, here are some of the Pros and Cons I can think of...
Pros.
- A sure way to prevent loss of either money or other important cards or folded jottings.
As for the Con, I can only think of one too... It will surely be a burden on your phone battery.
And one more thing, is it connected through GPS, WiFi or bluetooth? I think either one will tell how much burden it'll sure be on your phone's battery.