Fingertip pulse oximeter accurately determines your SpO2 (blood oxygen saturation levels) and pulse rate, displayed conveniently on a large digital OLED screen. Self-adjusting finger clamp with simple one-button design allows for easy operation. Features a low battery indicator and operates on low power consumption. Small portable size makes it easy to handle and carry for athletes, pilots, and healthcare workers to obtain quick and accurate oxygen saturation readings. Fast warning sign for COVID-19, COPD, and other respiratory illnesses. Requires 2 AAA alkaline batteries.