Get cycle computer data and mapping detail, all from one compact, easy-to-use device. Comes with a built-in basemap, plus it has a microSD card slot for adding street level or topo map detail and storing workouts, courses and saved rides. Measures your speed, distance, time, calories burned and altitude. For even more detailed data, get Edge 705, which can also track your heart rate, cadence, power (from optional ANT + Sport™-enabled third-party power meters), climb and descent. Weight: 3.7 oz.