Choose folder of photos or a folder of folders of photos will randomly place your pictures in the floating window. Play "in order" or "random". Folder on your Mac or external drive. Floating window can be moved anywhere on screen and selectable in 7 sizes and 7 refresh times. Photos are automatically sized by height, regardless of the actual photo image size, no cropping or distortion. It remembers all of your user selected choices. Photo play my be "paused" and displays the photo name and path. You can also go back one photo. There is a standard "Share" option as well! App uses minimum cpu and disk resources- it is very efficient!