This is a pair of portable tail lights.  They are battery operated, but could be converted.  They measure about 8" long and 5" high.  The battery box is 5" x 3" x 3".  They have an off and on switch on the side.  These are untested and being sold as is.  These are kind of cool looking, and would be good in a display. 

See photos closely and do your own research to make sure these will work for you.