Jakk Pacific's Spy Watch is a great gadget to do detective work.
It is pretty rad with the watch has to offer for spying on people. It features a built-in video camera that can capture up to 20 minutes of video, three hours of audio or still photos. The watch also has a built-in color video screen for image viewing and video playback. The captured media can then be uploaded onto a PC for further analysis. Now that's good detective work!