Initial IDM-830 8-Inch Portable DVD Player
Horrible DVD Player
I purchased the 853, it's the same unit with an 8.5 inch screen.  The first unit I purchased had bright red pixels all over.  I took it back and exchanged it for the same model, the second one played the DVD for about 30 seconds and then choked.  So I turned it off and back on again, but all it would do is say \\"Disc Unknown\\".  I took it back for a full refund.  This company makes the worst DVD players I have ever seen.