While most apps for iPhone are ok vertically, some apps are better used horizontally. Dashboard apps and most navigation apps can be named as examples. The holder is held in vertical or horizontal position by small neodmium magnets. I will post more photos after I trim the brim residues and install it in the car.Consists of: As you can see in the pictures, assembly is easy. So no instructions necessary. Just a few notes: Be carefull with the polarity of the magnets when inserting them. the ones on the bracket and the ones on the holder should be inserted with opposite poles facing each other. If you insert them wrong, it may be difficult to pull them out back. If this happens, leave the part on the hot bed of your printer for 15-20 minutes to allow the plastic to expand and try pulling them with another magnet again. Feel free to ask any questions you may have.