Note: the received model was configured in German, which made me lose a few minutes of operating comfort for the set in French.
The connection sometimes takes a little time to get established between the belt-torso and wristwatch.
In addition, it has happened to me to lose the signal during a run (for 30 seconds, or 1 minutes, 1 time in 1 hour). In my amateur level is not important, but the session is slightly distorted.
This is my first heart monitor, very good, meets all my criteria. Good value for money, air party to last.