Designed to check pulse rates and blood oxygen saturation levels in a quick and accurate way. A convenient and useful tool for every household, doctor, and nurses out there!! Main Features: Accurate, and Easy to Use - With just a press of the button, it shows your blood oxygen saturation (SpO2), pulse rate and pulse strength! Alarm function - You can set the alarm function that notifies you according to your needs. A warning will show once the measured values go beyond your preset setting Long battery life w/ Smart Power Saving - Only consume a little power and will continue to work for 6 hours straight. It will automatically enter its power saving standby state If there is no signal for 7 seconds Light-weight, and Portable - Easy to carry around with the included lanyard Accommodates wide range of finger sizes Powered by 2 X AAA batteries (not included) Why Is It Essential to Check your Blood Oxygen Levels? Low blood oxygen levels can lead to fatigue, lack of energy, and even dizziness Pulse Oximeters can easily pick up on decreases in oxygenation during your daily living activities, learning, and sleeping; decreases on such can alter the brain and body function or create problems that need to be corrected.