I am using the Moultrie with the 4.3" viewing screen. I did a software update as it was limited to what SD cards it could view. My largest SD cards are 8GB and they work fine. I view cards from various brands and series of trail cameras as well as various SD card brands. The viewer is used to check to make sure my cameras are functioning properly and set at the proper height and angle when I'm in the field. I swap my cards out and view them on the computer when I get home. All the best.