The Quest Wrist Oximeter With Memory is a lightweight and easy way to measure accurate pulse rate and SpO2 (percentage of oxygen saturation in the blood). The Wrist Oximeter With Memory has an automatic power capability and more than 50 hours of continuous working time. •Lightweight and easy to carry •Digital display of SpO2, PR, and Pulse Bar •Memory and review of data up to 12 hours •Data transfer to PC for storage •More than 50 hours continuous working time with two AAA batteries