Accurate Measurements:2 Person Memory Bank, Irregular Heartbeat Detection, Wide – Range Arm Cuff.About Your Cuff: This monitor comes with a wide – range arm cuff. Fits arm circumference: 8.6 in. – 16.5 in. (22cm – 42 cm). Traditional D – ring style cuff allows for easy application. Soft fabric with secure hook and loop closure provides a comfortable fit. Not made with natural rubber latex.