NOTE: 1.This device is for sports or aviation use only, not for medical use. 2.To ensure accurate measurements, you need to use the device at rest, not during exercise. 3.The oximeter face has a film to protect the screen. Portable Design: Ready to use out of the box,a pretty gift.Including pulse oximeter x 1, charging cable x 1, waterproof carrying bag x 1, neck lanyard x 1, wrist lanyard x 1, user manual x 1. We provide 7×24 hours after-sales service, 1 year warranty, any problems during the period, please contact the manufacturer via mail. 4 Directional Reading OLED Screen: The pulse oximeter uses an OLED screen to make the data clearer and brighter, making it easy to read, whether you are visually fatigued or nearsighted and elderly.4 directional readings are easier to read or record. Widely & Health enthusiast: o2 pulse oximeter finger measures blood oxygen saturation, heart rate, perfusion index. Measures most finger sizes, including children. Perfect for aviation, travelling, sports, peace of mind and anyone interested in blood oxygen measurement. Rechargeable oximeter: Rechargeable oxygen monitor fingertip perfectly solves the cost of traditional pulse ox which needs frequent battery replacement and the trouble of battery compartment back cover which is easy to fall off. It also adopts energy-saving design, automatically switch off after 8s without measurement, and can be used continuously for 15 hours after 2 hours of charging. Accurate & Efficient: Measurement is simple, just press the button, pulse oximeter fingertip is capable of displaying highly accurate measurement results within 5-8s with its advanced MCU chip and unique structure that prevents interference from external light.