who designed this [SEP] this tool works well and very quickly to straighten my hair it heats up very quickly it is easy to use without burning your hands or neck or scalp unfortunately the temperature controls are on the handle and it is impossible to hold and use the brush without pushing one of the buttons so i am constantly adjusting the temperature it is also very difficult to get the same straightening results at the end of my hair as i get near the scalp or thru most of the length as you brush through the hair the brush does not hold on to the ends the ends slip thru too quickly once you are thru the bulk in the middle of the hair