+ Safe Lock
+ Simple connection
+ Clear app on the Android device (from KitKat, Android 4.4)
+ Transmitter can be well removed from the bracelet
+ USB charging cable fits perfectly
Contra
- The little light is nice, but blue and turquoise are possibly (but I do not care) similar.
- No battery change is possible, according MIO he is only after 2 years have a 20% loss term (let's see ;-))
- USB cable is quite short with 6-7 cm, here is definitely an extension necessary