ACCURATE and RELIABLE - the new version consistently beats other pulse oximeter in terms of accuracy and reliability during clinical tests. Only 8 seconds, it shows your measured SpO2 and Pulse Rate(PR) and pulse strength on a high quality OLED display (with six multi-directional display choices).NEW ACCLAIMED FEATURES - Perfusion Index (PI) that will improve the reliability of the readings dramatically. The PI conveniently informs you of the strength of your pulse. The sleep monitoring function can keep the data record for 8 hours and it will start analysis after monitoring for more than 2 hours.SPORTS ENTHUSIASTS - Suitable for mountain climbers, skiers, bikers, aviators or anyone interested in measuring their SpO2 and pulse rate while on the move. SpO2 and Pulse Rate now faces instead of away from the user for easy read.EASY TO USE - Taking a reading is easy, just clip it on to your finger and turn it on at the press of a button. Finger chamber with SMART Spring System. Works for ages 12 and above. A LANYARD for convenience carrying and it needs 2x AAA Batteries for using (not included in the package).NEW SOFTWARE FEATURES - 1) Auditory alarm to warn you when your SpO2 and Pulse Rate are beyond set limits. 2) Auditory Beep for every detected pulse. Long battery life, it could continuously work for 20 hours.