ACCURATE, FAST AND RELIABLE - CMS 50 DL Fingertip Pulse Oximeter accurately determines your SpO2 in less than 8 seconds, SPORT/HEALTH ENTHUSIASTS - For aviators, sporting enthusiasts, skiers, bikers or high altitude climbing, the CMS 50 DL is a RELIABLE companion for quick and easy readings for oxygen saturation. DESIGNED for Sports and Aviation Enthusiasts and can be used as a heart rate monitor. ACCOMMODATES WIDE RANGE OF FINGER SIZES - Finger chamber with SMART Spring System. Works for ages 12 and above. Light and compact design, Dual colour OLED display, Quick measure, automatically power off, Low power consumption