Polar M450 GPS Bike Computer Tracks your cycling speed, distance and route Includes integrated GPS and precision barometer. Changeable color covers lets you customize the M450 to match your bike Includes Smart visibility front LED light for safety Compatible with Polar Bluetooth Smart H7 heart RATE sensor andcycling accessories. (Sold separately, not included) Generates personalized feedback and guidance to optimize training. Syncs to the free Polar Flow app and web service for workout planning, Strava connection and more. Display size: 3.5cm x 3.5cm