This very fine cover hardly increases the weight of the phone. A phone is integrated back there that can load the phone to a wireless base purchased separately. This is great! The window allows you to answer the phone, to see the time, weather, messages, take pictures, write a memo, listen to music, it's super nice to not open the bag all the time. So we can phone case closed or folded on itself. I added the Spigen magnetically clip to close the cover, it's super class and practice. The set is beautiful and functional. Only downside, the cleanliness of the window, and as a screen, I'm afraid he scratches ... To see the use, but I'm really happy!