Reliable and Accurate: pulse oximeter will help you monitor both oxygen saturation levels (SpO2), pulse rate and pulse strength on one display. It is backed by numerous clinical tests for its consistent accurancy Four-Direction Display: oxygen monitor fingertip allows a clear reading in all four directions, the two colour OLED screen will display real time heart rate and blood oxygen saturation in large numbers. It is thoughtful design for easy use Comfortable To Wear: oximeter has a noninvasive bulid-in silicon padding. It is more comfortable and better fit for long term use which can also accomadate wide range of finger sizes Suitable For All People: New patented Finger oxygen monitor system can accomadate different skin colours. You can carry it for results at home or outdoors. This pulse oximeter fingertip is great for sports and aviat such like mountain climbers, bikers, trainers, aviators, and general sport enthusiast Accurate Easy to use: One button operation, built-in infrared sensor will instantly start detection and then the measured SpO2(blood oxygen saturation) and PR(pulse rate) will be displayed on the colorful LCD screen within 10 seconds, measurement results within 1% precision.