Fitbit Ace 2 is designed for kids between the ages of six and above. Like its predecessor, it tracks fitness metrics such as active minutes, step count, sleep and hourly movement, but is easier to use, more durable, and comes in a more flexible design. It comes with a 0.72-inch OLED touch display with 19 animated clock faces.
Pros
Affordable
Kid-friendly design
Long battery life
Interchangeable straps
Cons
No heart rate monitor