And it looks like they have struck a great balance with battery life vs weight and size.
I use the Samsung Fit, which I chose due to having a small OLED screen, and more than two days battery life.
I generally get four-five days. (and quite often more)
We need devices with 'once a week' recharge cycles. Feedback sensors that need to be 'micromanaged', being checked for power, and put on charge, are not a perfect fit for the high paced world most of us live in.
Being a fashion part, these look like the perfect tool.
and just how is this resembling the Mi Band? oh, both are worn on the wrist...correct