【Extensive and easy to use】 this device for sport and aviation use only, not for medical use. used smart natural latex finger probe designed after most investigations, widely suitable kids, teenagers, adults, elders, pregnant women, athletes, or anyone interested. Bring the portable Oxygen Monitors always measure at any time in travel and sports, better to reaching your fitness goals or prevent discomfort. 【Accurate & Fast Reading】Accurately display the readings on a & 4 rotating digital OLED screen. within 8 to 10 seconds on large digital OLED Monitor display. ergonomic design of natural latex finger cover fits your finger skin more closely, all-round close-fitting measurement avoids inaccuracy. 【Suitable for all ages】Suitable for babies over 2 months old and Adults, Smart design allows for a of sizes to fit into the device, designed with latex free silicone material. Our oxygen saturation monitor can be used as a pediatric Blood oxygen monitor for kids and children as well as a blood oxygen monitor for adults. 【Portable Design Widely used】Light-weight and compact, easy to handle and to carry with you for results at home or outdoors. device is for exercise only, home, travel and aviation use only and is not intended for not medical use. sports enthusiasts take it with you to check your Blood oxygen saturation after flying, skydiving, running, hiking, cycling, swimming, climbing, skiing, high altitude climbing. or you can easily check your oxygen levels at home. 【Note: Battery Installation】 According to the Envro - nmental protectiondirective,our factory doesnot deliver AAA batteries. Please use the extra AAA batteries or old batteries at home. 1. Load the two AAA batteries into the battery bin correctly according to the positive and negative signs. Note: Install the battery correctly according to the polarity on the product label. Installing the wrong battery will cause you to fail to start, but will not harm the main components!