How it works

UV rays from the sun enter through the window in the band and are channeled onto the UV detector. This detector monitors UVA and UVB, which are the sun's rays that can burn you, and does not simply detect sunlight.

A program in the memory chip calculates when it's time to apply more sunscreen, based on the guidelines from the World Health Organisation and World Meteological Organisation for reapplication of sunscreen.

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