Features of Duplicate File Detective:

- Support Drag and drop
Drag and drop folders directly onto the selection window.
You can add folders before scanning.

- Choose to scan as many folders as you want
Choose to scan as many folders as you wanteven checking for duplicates
across multiple hard drives or external devices.

- The fastest detection algorithm.
Quickly reveal all your unnecessary duplicated files to save time.

- At a glance summary of wasted space.
Locate duplicate images, audio, archives, entire folders and more.

- A single click shows files in Finder.
Get rid of duplicated files easily.

- Easy selection of duplicates to delete.
Remove duplicated files with just one click.

Compatibility: OS X 10.7 or later, 64-bit processor

More info - https://itunes.apple.com/us/app/duplicate-file-detective/id674398427?mt=12