A blood pressure cuff is a device used to measure blood pressure, with some models relying on the oscillometric method and others on auscultation. A common design involves a cuff that the user fastens to the arm, often using a D-ring. These cuffs come in various sizes, such as small and standard, to accommodate different arm circumferences. The specifications include the method of measurement (oscillometric or auscultatory) and the size of the cuff. Non-invasive upper arm blood pressure measurement with a cuff is a preferred method.