Come and see our amazing products. The oxygen can accurately measure human blood oxygen saturation (Sp02), pulse rate (heart rate), and display 4 kinds of data or graph: oxygen level, pulse rate, pulse rate bar graph, pulse rate waveform.Whether you are a climber, runner, skier, pilot, child, adult, or elderly person, you can monitor anytime, anywhere. Please be sure to use the product in a stationary state.Only need to install two AAA batteries, clamp your finger with the oximeter, press the button for about 0.5 seconds, wait for 8-10 seconds after turning on the device, and then it can measure the data.The device will automatically shut down after 8 seconds of inactivity to avoid battery drain due to forgetting to shut down.This product is medical grade, conforms to FDA standards and has reliable quality. Pls confirm further with us if any query about packing info, inventory status and time schedule.