Designed to hold 2 Brookstone HDMI Mini Projectors for watching dual recorded files in 3D! http://www.brookstone.com/hdmi-pocket-projector?flag=search&question=mini+pocket+projector&_requestid=175651 https://www.youtube.com/watch?v=eoCu5bJqwpcYou will need left and right hand polarized projection lenses, as well as your 3D glasses. View the link to understand how to set it up. https://www.youtube.com/watch?v=IlW73VQnaQg I also included a holster for a small motor which is meant to rotate a 9" (alternating) slotted disc. This feature is not mentioned in the link displayed. It is though an important Z-screen concept which alternates the image displayed to help differentiate between images. http://www.tomshardware.com/reviews/3d-polarized-projector,2589-4.html