Beautiful clock with many functions, but unfortunately for pulse measure completely unsuitable. After the start of a run I had already after 50 meters a pulse of 170 and after about 1 hour of running only the pulse was 35. What did the clock measured I can not say my pulse it was not in any case. The Speedbox worked flawlessly and very reliable. I had this sign just before each run again at the clock. The unit I have returned twice. Amazon has now refunded me the money.
