Rossmax Cone Cuff Small comes with an ergonomic, cone-shaped design to promote blood pressure measurement to a whole new easy and delightful experience!. This Rossmax cone cuff large has measurements of 18-26 cm (7.0"-10.3"). 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. Rossmax has the comprehensive product range in the field of fever management and monitors health conditions on a professional and most accurate level. Rossmax - your total healthstyle provider for monitoring and treating world's major chronic diseases!.