The Remo Duplicate Photos Remover software would read all the photos on the device and displays you the found duplicate photos. You could then checkmark the photos or sets you wish to delete and proceed ahead with the deletion.
The iOS and Android Apps does not have any limit on the number of photos to delete. Whereas, the Windows and Mac version would delete 15 photos in the trial version. Once you have activated the software, you would be able to delete the all the duplicate photos at once.