I bought this activity tracker for my 10 year old daughter. The tracker works fine, identifies different activities correctly and looks good on her small wrist. Battery life is acceptable for such a small device. The only flaw is the bracelet, it came apart after only four months of use. I contacted W. B. W. and I'm waiting for a resolution.
I'm a little disappointed in the watch compared to the Vivosmart HR. I love the comfort and thinness of the watch but navigating is annoying compared to the HR. But the comfort is much better for my skinny wrist. The large watches make me look like Buzz Lightyear !