The Garmin Vivofit 2 is the updated version of the Vivofit. The only activity tracker with a 1-year battery life, backlit display and move bar with audible alert that reminds you when you have been inactive for too long. Vivofit 2 follows your progress 24/7 and shows your steps, calories, distance and time of day on its easy-to-read, backlit display. Set the sleep mode when you go to bed and it will monitor your rest. At Garmin Connect, you can see your total sleep hours as well as periods of movement and restful sleep. Vivofit 2 is water-resistant, so you can shower or get caught in the rain, The Vivofit 2 has the capabilities of connecting to a Garmin Heart Rate Monitor for other readings such as hear rate based calorie computation.