Jobst Relief 30 40 Thigh Hi OT Beige XL Emergency Phone Pager Systems s AFD technology provides enhanced Color:Yellow s AFD technology provides enhanced acoustic response: light pressure for low bell type frequency firm pressure for high diaphragm type frequency Extra large bell (1 3 8 diameter) for unsurpassed low frequency response Ultra sensitive diaphragm (1 3 4 diameter) for greater amplification and crisper high frequency response Non chill bell and diaphragm retaining rims for patient comfort Clinician headset boasts reinforcing yoke molded into flexible 22 PVC tubing and stainless steel binaurals fixed at 15ß angle for greater comfort Tubing is soft flexible and made without phthalates Adsoft Compatibility: iOS mobile devices: iPhone 5 and later with iOS 11 or later 11 1 2 13 * Calf Circ 13 3 8 19 5 8 * Thigh Circ Thigh High ( Open Toe) No Silcone Band * Beige * 30 40 mmHg * X Large * Ankle Circ