Dogtra Pathfinder for Small Setter

I recently picked up a little English setter. She is a year and half and weighs in at 34 pounds. My former dog was a 73 pound Weimaraner.  I have a full size Dogtra Pathfinder collar. Was fine on my Weimaraner but seems huge on the setter. Looking at the mini version. Does anyone have one and is it that much smaller?  Looks like range is cut in half. 

NVM. Went ahead and picked up the smaller unit. Working like a charm.