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Description: The Fitbit One is a wireless activity and sleep tracker. Throughout the day the Fitbit One measures steps taken, distance covered, calories burned, stairs climbed, weight patterns and food intake. During the night it monitors the length and quality of your sleep. The One has built-in Bluetooth connection so all of these stats are viewable through a mobile application or your desktop, and with a week-long battery life, the One will unobtrusively incorporate into your daily life.