All in one GPS heart rate monitor tracks your cycling speed, distance and route using the latest GPS technology (SiRFstar IV) * Slim and lightweight design with rechargeable battery (12 hours in continuous use with GPS on) * Unique Polar Smart Coaching features such as Training Benefit gives you instant feedback after your ride * Shows GPS - based altitude during and after training * Compatible with s3+ stride sensor and polarpersonaltrainer.com, our free training diary where you can download endurance training programs