It seems odd that a category such as digital photo frames would have an entry level, but that's just what Hannspree's SD7021 7-inch digital photo frame is. You won't find a remote control, fancy slide show options, multimedia playback, changeable faceplates, Wi-Fi, or even an abundance of internal storage for photos. What you get instead is a rock-bottom sub-$40 price tag, a good-looking display and faceplate, and a modest feature set that does just enough.
With its stand attached, the SD7021 is just 2.5 inches deep--a pretty small footprint (it is wall mountable as well). The faceplate itself--a simple, glossy, black plastic frame that will work in almost any environment--is 9.1 inches wide by 5.4 inches high. The display is wide screen--7 inches diagonally--which means standard aspect-ratio photos will require cropping, either manually by you or automatically by the frame. The frame can be used in either portrait or landscape orientations; just stand up the frame and photos will automatically rotate appropriately.
On one side, there's a power switch, and on the other side are a three-in-one memory card reader (SD/SDHC, MMC, MemoryStick/MemoryStick Pro) and a full-size USB port. The SD7021 has only 8MB of internal memory. While it does an admirable job compressing images copied to memory, the quality noticeably degrades. You're better off investing $5-$10 in a dedicated SD card for the frame. Or you can pop in a USB thumbdrive, though it will stick out from the side of the display if you don't use a USB extension cable. Only JPEGs and BMPs are supported; you won't find any video or MP3 playback here.