This is the portable fingertip oximeter with a large, bright display that makes it easy to monitor blood oxygen saturation and pulse rate at home. Ideal for athletes, aviators, or those with respiratory conditions, you simply insert a fingertip and press a button to simultaneously display blood oxygen saturation (SPO2) and pulse rate (BPM). Unlike lesser units with undersized numbers and dull monochrome displays, this unit shows readings in big, bold numerals on a bright 0.96" dual-color OLED panel. One button cycles through six display options and four directions to let you choose a preferred view with uncomplicated ease. Auto shut-off and low battery indicator. Includes two AAA batteries. 4 1/2" L x 1 3/4" W x 1 1/4" D. (2 1/2 oz.)