Given that a GPS module or foot sensor typically cost more than € 70, pay 120 € for the Oregon SE300 is a pretty good option. Can be used only to race, since the sensor is designed to detect strides.

It also has an alarm quite useful in my opinion, the vibrating alarm when you pass a range of keystrokes. This is utli if you bring an mp3 and you can not hear the alarm sound or if you want your training compis know what speed you go.

It has a memory of 66 laps and informs us what percentage of the calories you burn fat based, something interesting for those who train to lose weight. In short, very cheap but a heart rate monitor with basic features and the addition of the velocity meter.