Patented PPPVCSILICONE Solar UV Meter Bracelet check low, moderate, high or very highextreme level of Solar UV radiation;The center area of the Solar UV Meter Bracelet can change colors according to Solar UV radiation, higher the Solar UV radiation, deeper the color change, compare the color change to the 4 standard colors(low, moderate, high, very highextreme) around and you can see low, moderate, high or very highextreme level of Solar UV radiation; Tell you when is the best time to use solar charger or similar solar equipment effeciently: Low: UVI 1-2, Solar energy equipment can not be used; Moderate: UVI 3-5, Solar energy equipment can be used but the efficiency is low; High: UVI 6-7, Solar energy equipment can be used but the efficiency is mid; Very HighExtreme: UVI 8-11+, Solar energy equipment can be used and the efficiency is high. Tell you UVIndex and SPF of sunscreen you should apply: Low:UVI:1-2, SPF
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