Stroke of luck, membrane installed at once, without using the instructions or accessories.
It fits perfectly to the smartphone Samsung Galaxy GT-S7560 Trend. Once installed, it hardly shows.
Some small air bubbles in the beginning but by passing the finger over it, they virtually disappear all. The last little bubble, I spent the finger just before and at the beginning of the bubble to push down on the edge and she does not see.
One of the tabs leaves a little glue on the membrane after installation. Just spend a little hot water on the glue and scratching. It takes 3 minutes but no trace afterwards.
As this is such a new, I have not tested before and after installation of the membrane but I experienced no discomfort after installation, the keyboard is very responsive and the membrane is barely visible.