Standing Bookmarker / Bookmarker

It is a bookmark which helps you concentrate on reading or watching a smartphone.
When you put a phone on the base of the bookmarker and start reading in the next time, the bookmarker will keep standing because of the weight of the phone. When you want to play with the phone for a while, you can look at the bookmarker on which the reading mark will remind you to continue reading. Moreover, you know that the bookmarker will fall down when you pick up the phone. So, it is better to read books carefully.
After reading, you can pick up the phone, put the bookmarker in the book and start to browse information on the phone.