Accurate and Reliable The iHealth AIR Wireless pulse oximeter accurately measures your SpO2 (blood oxygen saturation) level, pulse rate and pulse strength in seconds. Results are conveniently displayed on the large digital LED screen and can be monitored on your smartphone. Advanced Features via smart app. Pair the pulse oximeter with the free iHealth MyVitals app to easily record data for multiple users and track your SpO2 and pulse rate trends by hour, day, week and year. Built-in rechargeable battery. Say goodbye to the hassle and extra cost of constantly replacing batteries. AIR has a built-in rechargeable battery that can be easily recharged using the included Micro-USB cable. With just 3 hours of charging time, you can use it up to 300 times on a full charge.