I made my own prewarmer last year,12v atv handwarmers.It took forever and peaked at 140 f. I got that other warmer and it works exactley the way i want,i was so happy to have an over the counter option.It only draws 60 watts i need that at my track, limited electrical.Now we have another to choose from GREAT,a couple of friends are also interested.ISN'T it great all buggy's are not just Kyosho we have a choice.