car seat phone holder

I made this for a friend that need it something like this to be set behind the driver seat to have a cell phone to distract his son while he drives. He had a hard time trying to hold the phone and drive at the same time, so this will allow him to distract the kid with some videos while he drives.

Note: You just need to get the bolt,washer and nut from a hardware store and the elastic band from any hobby store.