ACCURATE AND PROFESSIONAL: Our fingertip oxygen accurately monitors measure O2 level Pulse Rate Perfusion Index and Pulse Strength in 8 secondsAutomatically powers on/off TWO MEASURING MODE: Spot check and continuous measuring for optional With analysis result of pulse rhythm displayed on the screen BUILD-IN MEMORY: Up to 12 groups data of O2 level and Pulse Rate in record list screen Quickly view your last 12 times historical data with one click AUDIBLE & VISUAL ALERT: When measuring if O2 level value or pulse rate value exceeds the preset limit the device will alert with beep automatically and the value which exceeds limit will flash on the screen Suitable for sports and/or aviation purposes--COME WITH ACCESSORIES: Includes 2 x AAA batteries placed and removed easily a carry pouch to protect the device and a lanyard for convenient carry