The Dream Blaster by Mad Catz is a third-party light gun for the Sega Dreamcast. Though once intended to be a cheaper version of the official Dreamcast Gun, The Dream Blaster was licensed by Sega, but remained a third-party alternative.
The Dream Blaster is functionally identical to a regular Dreamcast Gun, though may have been chosen by Sega for its aesthetics (i.e. it doesn't look like a real gun). There is a row of LED's that flash with each pull of the trigger.