No it is not the latest smart watch but a magnetic pin holder bracelet with a particularly trendy design!

Arm pin cushion with magnetic metal plate. Storage of pins, sewing needles, etc. Flexible silicone bracelet. Easy to use. From Prym

This adjustable magnetic bracelet allows you to have needles, pins or any other metal sewing accessory close at hand.
This adjustable silicone pin holder provides softness and comfort by adapting to all types of wrists.
The large size of the magnet plate accommodates all sizes of sewing pins and sewing needles. The strong magnetic power allows a perfect hold of the metal parts.