There is no demonstration mode function for this device. The pictures that come preloaded on your clock can be replaced by your own pictures. If you want to change the picture in clock mode, connect a USB device or SD card and then select the source on the device accordingly. Viewing photo 1. Plug a compatible USBdevice into the USB port, or a memory card into the memory card slot. 2. Select the folder for the USB device or memory card. Press OK to open the folder. 3. Press PHOTO/VIDEO to switch to photo mode. 4. To display a picture in full screen, select a thumbnail, and press OK. To view a photo in clock mode Press OK to access the thumbnail, then select the photo and press OK to confirm.