D Ring Cuff Small 7 to 9 Omron Foam Wedges Slants ) Resonant auto tuning technology continually Jobst Ultrasheer 30 40 ThighHi ) Resonant auto tuning technology continually measures and adjusts to changes in the patient's impedance to provide maximum energy transmission resulting in faster heating and shorter treatment times Adjustable Flow Regulator Easy to turn knob conveniently placed directly below gauge for easy use and control Knob has safety lock feature which will not allow the knob to be twisted off Durable D ring contoured cuff fits arms 7 in circumference * To determine your arm size use a cloth measuring tape and measure the circumference of your left upper arm midway between your elbow and shoulder * The Small Cuff is compatible with Omron Blood Pressure Monitor models: BP710N BP742N and BP765