dot water sensitive sticker turn red when got wet device potential damage indicator warranty void warning label repair guanantee

material: water sensitive paper, white color, turn red/blue when contact water, and never fade. it's writable with a pen or marker, you can put additional information on it at anytime. purpose: water exposure indicator for packages or devices, if you see the label is red, potential damage may occured. usually it shows that repair guanantee invalid. how to use: usually this water exposure sensor stick to the inside of goods, such as mobile phone, tablet, lap or other electronics devices etc. the sticker can be applied to almost any clean smooth surface such as wood, ceramic, glass, paper, plastic, metal, and more..syi