Microsoft is joining the parade of tech companies flooding the crowded wearable health space with a big bet that it can make its way not only to consumers’ desks and laps, but onto their wrists, too. The company announced a new device Wednesday evening called the Microsoft Band, which will be coupled to a service called Microsoft Health. Microsoft Band works much like a Fitbit or a Jawbone Up: throughout the day, it tracks your heart rate, steps, calories burned and the quality and length of your sleep.