Veridian Healthcare SmartHeart Pulse Oximeter safely monitors oxygen levels and pulse rate with one-button operation. Accurately measures oxygen saturation of arterial hemoglobin and pulse rate; Accomodates a wide range of finger sizes; Large LCD display with red backlight; Display Blood-Oxygen Saturation (SpO2), Pulse Rate and Pulse Bar; No prescription required; Low battery indicator; Automatic shut-off; Latex-free; Quick release lanyard.