The Morris Midi Slave Di is a DC slave flash unit that can be used for lighting small groups of people, as an accent, or background light. It features a standard (1/4") tripod mount socket, and built in slave.
Two slave settigs allow this unit to be used with either standard cameras, or even with digital cameras that use a pre-flash. The N-mode is for single flash triggered by the camera's flash and syncs with the main flash. The P-mode is for cameras with pre-flash. This sets the slave to sync with your camera's main flash, not the pre-flash.