Systems and methods of unattended treatment

A method of treating body tissue using a non-invasive body contouring system, comprising:

• providing a first frame and a second frame, wherein the first frame and the second frame are connected, the first frame comprising a first fastening member, the first frame defining a first aperture, the second frame comprising a second fastening member, the second frame defining a second aperture;
• coupling the connected first frame and second frame to a patient's body in a fixed position such that a first tissue treatment region extends into the first aperture and a second tissue treatment region extends into the second aperture;
• coupling a first applicator to the first frame, using the first fastening member;
• coupling a second applicator to the second frame, using the second fastening member;
• generating treatment energy from a source disposed in a housing of the non-invasive body contouring system;
• delivering the treatment energy to the first applicator via a first umbilical extending from the housing to the first applicator;
• and
• delivering the treatment energy to the second applicator via a second umbilical extending from the housing to the second applicator.