I have a newer Medtronics model SCS just got a year ago. Its only a little bigger maybe than a silver dollar. Its pretty small. Mine is cervical but my generator is planted in my rear in end near the back pocket of a jean. I am not a small skiiny perosn about average but I can feel the implant. It doesnt really bother me. What bothers me is that my RSD spread to that area & other areas in my back when I had suregry for the implant. I would not want to go without my SCS. It is a great deal of help. I would check out the differnt websites for the companies it gives the dimensions of the devices & shows pictures.