AccuMed Pulse Oximeter, Sp02 Finger Blood Pulse Oxygen Monitor, w/Carrying case, Lanyard Silicon Case & Battery CMS-50D (Blue) Remove the back cover and install the two AAA batteries included in the box. Insert your finger by aligning it with the red light and wait for the oximeter to switch on. Read the results in eight to ten seconds. OXYGEN SATURATION or SpO2 LEVEL: Shows the percentage of how much hemoglobin in your blood is carrying oxygen, with normal levels at 95% or greater PULSE RATE: Provides the number of heartbeats per minute PULSE INTENSITY: Displayed as a bar graph PULSE WAVE: Shows the strength of your pulse in wave form <span class="a-text-bold">Box Contents: </span>2 AAA Batteries, Lanyard, Silicone Cover, and Travel Case <span class="a-text-bold">Available Colors: </span>Black, Blue, Pink, White, and Yellow <span class="a-text-bold">Display:</span> Digital Tube <span class="a-text-bold">Screen Information: </span>Shows SpO2, Pulse Rate, and Pulse Intensity <span class="a-text-bold">Battery Life: </span>24 hrs. <span class="a-text-bold">Screen Brightness Adjustment: </span>No <span class="a-text-bold">Auto Power Off: </span>Yes <span class="a-text-bold">Box Contents: </span>2 AAA Batteries, Lanyard, Silicone Cover, and Travel Case <span class="a-text-bold">Available Colors: </span> Black and Blue <span class="a-text-bold">Display: </span>OLED <span class="a-text-bold">Screen Information: </span>Shows SpO2, Pulse Rate, Pulse Intensity, and Pulse Wave <span class="a-text-bold">Battery Life: </span>32 hrs. <span class="a-text-bold">Auto Screen Rotation: </span>Yes <span class="a-text-bold">Screen Brightness Adjustment: </span>Yes <span class="a-text-bold">Auto Power Off: </span>Yes <span class="a-text-bold">Box Contents: </span>2 AAA Batteries, Lanyard, Travel Case <span class="a-text-bold">Available Colors: </span>Black, Blue, and White <span class="a-text-bold">Display: </span>OLED <span class="a-text-bold">Screen Information: </span>Shows SpO2, Pulse Rate, Pulse Intensity, and Pulse Wave <span class="a-text-bold">Battery Life: </span>20 hrs. <span class="a-text-bold">Auto Screen Rotation: </span>Yes <span class="a-text-bold">Screen Brightness Adjustment</span>: Yes <span class="a-text-bold">Auto Power Off: </span>Yes