Magnavox MPD850 8.5 in. Portable DVD Player

Picture is fine. Sound is fine. Screen size is large enough. Has front panel buttons to do many functions. Tilt screen is helpful in less than perfect viewing conditions. Removable battery is a little odd in shape and placement but does not present too much of a problem.
I am returning this unit because it will not do what I need it to do. I purchased MPD 850 because it has AV Out and I need a unit for playing DVDs during presentations. After using several other borrowed units for this purpose I decided to buy my own. Unlike all the other units I have used, the MPD 850 will not show an image on BOTH the unit screen AND the separate screen. It is either one or the other. That is a shame because overall it seems to be a fine machine.