This tiny wearable device tracks a user’s every move, even while she’s sleeping, using three-way motion sensors called accelerometers. It uses this data to determine useful information like calories burned, steps taken, distance traveled, even the quality of a person’s sleep. The FitBit can be worn on just about any article of clothing, but also on a wristband.
A user’s collected activity data can be displayed on the device, but one of the features of FitBit is that it automatically transfers the data to the Web when a user walks within 15 feet of a wireless charging stand. This stand has to be connected to a computer that runs the FitBit software. The cost: $99, but consumers will have to wait until February 17 for orders to start shipping.