I am selling a Guest Judson Micro-sync.  It has a port slow, sync, starboard slow, and an on off switch.  It measures roughly 4" x 3 7/8", the mounting bracket is 4 3/8" x 1", and the mounting holes are 2 1/4" on center.  It is used but in great running condition.  For more information regarding this item contact a dealer in your area.  (LH / 49.3 / 9038958) (6)