Your Fitbit counts the number of steps you take each day with a three-axis accelerometer, translating recorded motion into readable data. Fitbits are frequently less precise in measuring distance traveled and calories expended, but the step counter is regarded as dependable. The Fitbit I Wear... is a smartwatch that works with the Fitbit app for iOS and Android devices. It shows time, dates, the amount of energy spent during activity, notifications from Twitter and Facebook, and more. The Fitbit I Wear... also functions as a GPS tracker for hikers and travelers. The Fitbit Zip is a wearable activity tracker that can be used to track steps taken, distance traveled, calories burned, and more. It connects to your smartphone via Bluetooth, allowing for messages to be sent directly to it. This fitness tracker has an integrated phone holster that can be used to hold it while making calls or texting, and it has been praised for its compact size and design. The Zip also comes in different colors including black, white, silver, red, green, blue, and pink. The Fitbit One is a wristband activity tracker that measures the number of steps taken, the duration of exercise, and the calories burned. It uses the user's body temperature to calculate the amount of energy expended during activity, and it can stay worn throughout the day without being removed by the user.