I love this little powerhouse projector . the image quality be great ! I have try several connection to the projector . usb thumb drive - I have test several - a new thumb drive with a small amount file on it work best . I load a couple of movie file and a PowerPoint it seem to work fine with both . I plug in my trusty back-up Sandisk that I purchase about a year ago , with several file , it recognize that it be a mass storage device but it do not recognize that I have any file on it . I take my Micro sd card out of my android phone and it could see the file and folder . I could view Office document -lrb- but it would not open up pdf -rrb- . I could also view video , music , etc from this . hdmus connection I have issue with the two Android smartphone that I test -lrb- non-iphones -rrb- the problem be that you have to plug the device in before you start , if you plug it in after you turn on the projector it would go into search mode and not pick up the device . I project the image on my pale yellow office wall , with two light on , and I could still see the image clearly , it get better as I turn out the light . the window light still come in , and I still get a great image . so far so good . con : just one Vivitek customer support be very difficult to get through to , and when you do they do not return phone call .