This is an arm holder for iPhone 4 and 5, it is composed by: 1) an adjustable clip that can be attached to different types of surfaces (from 1cm to 3cm of thickness like desk, table or shelf), 2) an adjustable arm based on the ball socket joint, 3) a case for iphone 4 and 5. Thanks to the ball socket joint it is possible rotate and move the phone to the position you like and pieces can be added to make the arm as long asyou like.