SantaMedical SM-165 Finger Pulse Oximeter is an affordable and accurate way to check pulse rates and blood oxygen saturation levels. Self-adjusting finger clamp plus simple one-button design allows for easy operation. Small portable size makes it easy to handle and carry. Helpful for athletes and pilots to obtain quick and accurate oxygen saturation readings. Deluxe features include an easy to read bright color OLED display. Integrated SpO2 probe and processing display module plus Pulse Rate, bar graph and Plesthymograph wave that measure pulse strength. Auto power off. Low power consumption on 2 AAA batteries. Comes with a hanging neck/wrist strap and case for use on the move. Intended use for spot check of pulse rates and blood oxygen saturation level at home, in sport and recreational use, such as mountain climbing, high-altitude activities and running. Not a medical device.