The Polar F6 is an excellent clock clock. Before you use the clock, you should take the time to go through step by step instructions. If you have understood everything that is not a problem with the clock, the operation is simple. The clock is waterproof and suitable for swimming. But not for diving. A Polar T31 Transmitter (transmitter) with belt, is in the clock case. Who wants to swim with the clock, should bear in mind that the chest strap (size M) can slip though the chest belt was tightened on's maximum. I had this problem. Jogging and cycling, there were no problems with the chest strap. So no slipping.
Conclusion: you can tranieren very well with the Polar F6 clock. Operation super and pleasant. I would recommend this every clock.