Fitbit Ace 3 with activity tracker, 8-day battery life launched for kids Fitbit Ace 3 with activity tracker, 8-day battery life launched for kids The fitness band comes with up to 8 days of battery life, attractive clock faces, daily activity dashboard, swim-proof up to 50 meters, sleep duration tracking, and more. advertisement HIGHLIGHTS The popular wearables brand has launched Fitbit Ace 3 for kids aged six and above. Fitbit has launched the Ace 3 at a price of $99.95 (roughly Rs. 7,300) in the US. Fitbit now has smartwatches that are solely designed for kids. The popular wearables brand has launched Fitbit Ace 3 for kids aged six and above. So now the kids can also track their activities and sleep. The fitness band comes with up to 8 days of battery life, attractive clock faces, a daily activity dashboard, swim-proof up to 50 meters, sleep duration tracking and more.