Rossmax Digital Korotkoff Cone Cuff comes with an ergonomic, cone-shaped design to present you a whole new easy and delightful experience. This Digital Korotkoff Cone Cuff Large has a measurement of 34 - 46 cm or 13.4 - 18.1 inches. Digital Korotkoff Sound (DK) Technology Digital Korotkoff Sound (DK) Technology is a combination of the oscillometric method and Korotkoff Sound Method. Supported with an advanced dual-sensor cuff system (built-in pressure sensor plus sound sensor), the Rossmax DK Technology offers accurate analysis to the oscillation and K-sound, which perfectly integrates the convenience of Oscillometric Method and the expertise of the clinically trusted Korotkoff Sound Method. With a proprietary microphone built into the arm cuff, the innovative DK Technology actually listens like your doctor when taking a reading. The Exclusive DK Technology delivers absolute accuracy by using the advanced dual sensor cuff system that senses both pressure and sound.