For those who like to keep things simple, the CS100b is for you. It comes without a heart rate transmitter, so it?s ideal if you already have another Polar product or if you simply want a cycling computer without heart rate monitoring. It measures your current, average and maximum speed and estimates…

This slim, light and waterproof T31 doesn?t have the benefit of coding for interference free transmission. However, its purpose remains the same: to transmit your heart rate to your wrist unit ECG (electrocardiogram) accurately.