Thank you, Lawrence. The first models did not have cycle selector buttons, right? The first one got rid of the push to start button and just had the air freshener, I think? You pulled out on the timer dial to start which made the whole control panel flex disturbingly. Then they went back to a push to start button. Sometime after that, maybe the last model you mentioned there was a bank of small white buttons, including "ECONOMY" to run the dryer on 120 volts on the auto dry cycle along with the push to start button, but I don't remember more, although I guess if there was an economy button there would have to be a Hi Speed button or something similar.