In the past few years, we have covered plenty of cool smart wearables. Tweexy does not pair with your phone, nor does it track your activity, but it serves as a nail polish holder. It holds your polish in place while you paint your nails. It fits all sizes of nail polish bottle.
The device fits all fingers (from 3-17). It is made of rugged silicone. Costs under $22 at this time.