At first I was a bit skeptical, because if it is not yet on the arm looks quite large and thick. However, it is incredibly easy, so that they practically do not feel when running. The Bedinung is almost intuitive, once I looked in the manual, but more from intrested. It serves over long or short press. whereby the long press is actually long, about 5 sec. By continuous perforation of the bracelet wrist is well ventilated and be firmly fixed also to a thin woman's arm. The chest strap is also available for people relatively narrow in its smallest setting. am thrilled!