An ultra-portable projection screen with a rugged aluminum (steel-like) housing that protects the screen during transport. Comparison of Portable Movie Players Product Name Screen Size Battery Life Key Features GOnavidio Portable Blu-Ray 4K/Blu-ray SteelBooks 270° swivel screen, HDMI out LG StanbyME Portable TV Premium "Fancy" Look Touchscreen, wheels, sleek design HotHat Portable DVD Player Budget-friendly portability ~6-7 Hours Anti-shock, 180° flip for cars specific 4-movie collection