A lightweight, inexpensive monitor for measuring SPO2 oxygen saturation and heart rate during physically active and high-altitude activities. The SPO Check Mate finger pulse oximeter offers the user a greater ability to monitor these vital signs under motion and is less expensive than most available devices. Can be used outdoors in many conditions, including high altitudes, at high and low temperatures, and even in the dark Soft rubber boot sensor keeps it in place even while you are in motion. Can be used while in motion Battery life indicator Superior Battery Life (1000 hours) Digital LCD display for SpO2 and pulse rate with BACKLIGHT 2 year manufacturer's warranty