Wristband (IMAGE) University of Granada Caption The emoticon faces on the wristband successively 'light up' as exposure to UV radiation increases. Credit University of Granada and RMIT University of Merlbourne Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.