Wearable devices have just ventured into a new area: beauty.

French cosmetics giant L'Oreal recently released the La Roche-Posay My UV Patch, a wearable device that combines sun protection with digital technology, at the 21st edition of the China Beauty Expo in Shanghai.

Called an "internet on paper" invention, the device comprises a heart-shaped paper skin sensor with UV-sensitive dyes that change color depending on UV exposure.