Fast and Accurate Results: After exercise, simply turn on the button to the test, and get the results you need in just 5 seconds. The high-definition TFT display saves time, making it perfect for sports enthusiasts! Portable and Easy to Use: This sports and aviation oximeter is easy to use; just click the quick-off button to the test. It's and comes with a lanyard, making it easy to carry for fitness, running, hiking, and other activities. Comfortable: Made of high-quality materials, it's soft and comfortable, and fits all sizes. Clear and Easy-to-Read Screen, No Accessories Required: The dual-color screen has a very thin protective film that can be removed before use. Accurate data display. Accessories include: 1 sports and aviation , a long lanyard, and a user manual. Please note: This is for sports and aviation use only and is not a medical device. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.