A mobile assembly of electrically-powered devices intended to temporarily minimize the manifestation of cellulite, loose or wrinkled skin, and/or facial lines through the extracorporeal application of high-intensity/frequency ultrasound [e.g., high intensity focused ultrasound (HIFU)]. It is typically used on the head and neck where it generates low levels of heat in the targeted tissue to stimulate the cells for elastin/collagen production and tissue rejuvenation. It typically consists of a high-intensity/frequency generator/control unit, handpiece, transducer cartridge and connection cable.