The robust Fitbit Ace 2 was developed to make physical activity fun for children between the ages of six and twelve years old. They can track their activity and share it with others, which in turn motivates them to move even more. The fitness tracker also has other functions, such as a countdown timer, a stopwatch and the option to track sleeping habits. The armband, made of soft silicone with an optimised fit, is comfortable and grows with the child. The battery life extends up to five days.