A method and system for providing ultrasound treatment to a tissue that contains a lower part of dermis and proximal protrusions of fat lobuli into the dermis. With this arrangement, the opening of the choke valve is controlled in a rational way according to changes in engine temperature, to thereby stabilize warm-up operation and improve the fuel consumption rate. Related systems, methods and devices are described. Some of the feature modules can be operated separately from the docking station, and are completely interchangeable within the docking station. Preferably, the appliance includes a switch or sensor for toggling between the first and second control algorithms.