Polar RC3 GPS Bike with Heart Rate Monitor, Black 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