Fitbit has revealed a fitness tracker that also acts as a smartwatch. Joining two other wearables (the Charge and Charge HR, with small AMOLED screens), the Fitbit Surge features an LCD display. It includes eight sensors (3-axis accelerometers, gyroscope, compass, ambient light sensor, GPS and heart rate), activity recording, notification display, music control and up to seven days of battery life. More information will be available closer to the launch in early 2015, when it will cost $250.