Change Power In One Step, Not Four The Aaron 900ô high frequency desiccator forever removes the need to go through a tedious multi-step process to change from low to high power. The 900ís digital power control system allows you to change from low to high by simply pushing the up/down buttons on the handpiece or rotating the power control knob. Good News For Foot Control-If you need to use a foot control just plug it in. There is no need to purchase an expensive separate handpiece for foot control situations. The same auto-clavable handpiece that normally operates the unit allows for foot control activation and still retains the ability to activate the unit or adjust the output power via the up/down buttons.