GREAT FOR PHYSICALLY ACTIVE PEOPLE. This is perfect for runners, cyclists, & high performers looking to track their heart rate and SpO2 levels after engaging in sporting activities. Perfect for kids use too. ALL AGES | ALL SIZES. Our simple & ergonomic blood oxygen accommodates all finger sizes, so both kids and adults can use it. A perfect blood oxygen saturation for all ages. EASY-TO-READ DISPLAY. The item comes with a big digital display which shows your o2 saturationreadings in large, easy-to-read digits. Theres also a battery life indicator.