After full charge the battery lasts more than 2 days, then it turns off completely and you have to adjust again the time and date. If you want to go running spontaneously, you should hang on stream they prefer permanent.
Covers Find the GPS signal requires the clock on some days several minutes, there are also days when no signal is found.
The external processing is quite ok - had no significant problems so far. The operation of the device appears to be quite cheap and you must be very fast, because the device jumps to the starting position after a few seconds.
Conclusion: for this high price - the purest impertinence!