For Multi-sportspeople. With the multi RS800CX it does not matter what terrain and in what sport you're underway. The attached G5 GPS sensor measures not only your speed and distance, but also draws on your route. This you can after training with the software and Google Earth track and evaluate. Is included in a set of Polar G5 GPS sensor and the Polar IrDA USB adapter. Detail info manufacturer  

In competition cycling, time is of the essence. It determines whether you can keep up with the leading pack or if you|ll trail behind. So speed has a big part to play in your performance. Thanks to this aerodynamic and light wireless sensor, you|ll receive current, average and maximum speed readings so that you can get it right in training and ultimately, right on the big race day. Interference-free speed and distance data lets you evaluate and analyze your individual performance more accurately, Long range transmission of W.I.N.D technology enables you to attach the speed sensor to various places of your bike. Fits for RS800CX.  Detail info manufacturer