PPLS Pack of 3 kinds Water Liquid Damage Indicator Sticker When it gets wet with water, I react , and the history confirmation of the water wet is possible irreversibility. 0.12"(3mm) 340 pieces 0.16"(4mm) 520 pieces 0.20"(5mm) 380 pieces When this contains water, white turns into red Water wet confirmation of Smartphone,PC,Computer,Precision instrument. Please don't use on the metal surface