Responds to changes in arterial oxygen saturation typically one to two minutes sooner than digit sensors for patients with weak pulses. Maintains stronger signal integrity unlike ear sensors, which may cause pressure necrosis and are subject to vasoconstriction. Easier access to the forehead than to the hands, especially in the operating room. More accurate than all other ear, nose and forehead sensors. Contains LoSat expanded accuracy range (60% to 100% SpO2) when used with a Nellcor pulse oximeter with OxiMax technology . Effective for mechanically ventilated and supine patients. Can be used for up to two days with appropriate site inspections and changes