Dual Shot allows you to use two cameras (front and rear) to take one photo. The photo taken from the front camera is overlayed on the photo taken from the rear camera. You can move and re-size the front camera photo to anywhere you want without using Photoshop. If you want, you can put the photo taken from the rear camera into the inserted window and use photos taken from front camera as background.
Dual shot also works in video recording in the same way. This creates video in video without using any fancy tools. The length of the video taken under dual camera mode is limited to 10 minutes (HD) or 5 minutes (full HD)
You need to tap the camera button to set the camera in dual camera mode, then choose taking photos or recording videos.