Pressure level and session length can be adjusted anytime, even during session from the touch panel interface on the control unit — outside the chamber. From inside the chamber such changes are not available if the control panel is set exclusively for outside operator control. The possible commands from inside the chamber, without operator control are: start/stop and cooling switch on/off. If the operator sets the control panel to be operated from within, all pressure commands and other features are also available from inside the chamber.