Blizzow Desk Book Stand Holders for Reading Hands Free, Durable Metal Adjustable Book Stand, Sturdy Lightweight Foldable Portable Bookstand -Cookbook, Recipe, Tablet, Music Book, Documents (White) White electronics3 6inch distance between the side

6inch distance between the side release button and the arm gear for easy operation

the button hole is at bottom of case

You cannot see right through the envelopes

Retractable design: The whiteboard pointer is retractable

Blizzow Desk Book Stand Holders for Reading Hands Free, Durable Metal Adjustable Book Stand, Sturdy Lightweight Foldable Portable Bookstand -Cookbook, Recipe, Tablet, Music Book, Documents (White) White electronics3 6inch distance between the sideBlizzow Desk Book Stand Holders for Reading Hands Free, Durable Metal Adjustable Book Stand, Sturdy Lightweight Foldable Portable Bookstand Cookbook, Recipe, Tablet, Music Book, Documents (White) Adjustable Metal Reading Rest Tablet Study Room Book Holder Foldable Cookbook Stand Feature: Hands free and no assembly required, make you enjoy learning or working. The reading book holder can be adjusted at multiple angles, to prevent children from myopia.