I live close to the Black Forest and often ride the bike that was -. In addition to the aesthetic appeal of this very cool, not too thick brushing clock - the main reason for my purchase. I live at 200 meters, calibrate the clock (2 Simple Steps) and drive off. The other functions enrich myself repeatedly whether the barometer, compass or sunrise and sunset times are also or the thermometer. Above all the alarms I need often. Unobtrusive 8 beeps and then it stops. I had it. Once for 2 hours in the sun and since I still have full charge It is very easy and also seems as robust as it looks. I'm already a few times chipped or my children have it knelt, no problem so far. 2 hours, should deal with the manual until you set its latitude and longitude and the rest, then you can really enjoy. The nice thing is, if the shirt or casual, sportswear, it fits. Only with closer jackets at the collars I have from time to bother, I fummel constantly at the clock until it is, and then they slipped again. Stop is already a Brummer but as I said: not applied too thick. For smaller hands or arms woman the clock is not really suitable for my opinion, but you also must have no paws. Hey, I'm here on my sofa only to 190 meters of altitude, although I but previously calibrated habe..keine panic, the air pressure has changed, so make early tomorrow and then going on ...