0.78 inch OLED Touch Screen Bigger screen, fit the width of the wrist, bring pleasant feeling of wearing. Big screen display a comprehensive and rich information, raise the wrist, efficiency is obvious. Feature With 5ATM Water Resistant Rating One of the things that set the Mi Band 3 apart from many other feature-laden smartwatches available is its 5ATM water resistant rating - withstands pressures equivalent to a depth of 50 meters, making it a charm when being exposed in rain, splashing, accidental submersion, showering, surface, swimming.