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

Dimensions of the magnetic pin holder and composition:

Bracelet: 24 cm x 3 cm
Strap material: silicone
Magnetic plate 5.5 cm x 4 cm
Stainless steel plate

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.