The film has a detailed German manual which is actually pretty foolproof and even the odd useful tip was ready I could use personally. I bought the film for my Lumia 820 and was pleasantly surprised. I must say that I have before never bought or installed a display foil and therefore at least 3 experiments have used what in this film is not so bad is because if then nevertheless times dust has come behind, simplified with a strip of adhesive tape again can clean.