Wemelody 3PCS/Lot Outdoor UV Tester Band Bracelet Meter Watch Ultraviolet Rays Sensor Indicator Detector Color Changing Best Gift for Friends/Relatives and Loves Skin Protection(Dark Blue) This UV bracelet have clock form. The central part is made in photosensitive material and change the colour with the intensity of the UV radiation This UV chain Meter will help you to protect both your eyes and skin from the dangerous effects of the Ultraviolet rays the sun emits Looking at the color on the special surface of the UV Meter, you will always be alerted about the possible overexposure to the UV rays It can check low,moderate, high, very high/extreme level of sun UV radiation in seconds of sun exposure As a nice gift to yourself and your friends, keep safe in the sun