The wrist pulse oximeter features a color, multi-direction OLED (organic light emitting diode) screen with four levels of brightness. The easy-to-read 256k color OLED display can be adjusted to be readable either horizontally or vertically. The display shows pulse rate, blood oxygen saturation, pulse waveform, pulse bar graph, and battery level indicator. This is not a medical device and is perfect for sports, aviation and home use. The pulse oximeter can sound an alarm in the following scenarios: when the pulse rate or oxygen saturation drops below a pre-set level, when the oximeter unit isn't correctly positioned on the finger, when the battery level is low. Comes with software link for Windows PC only.