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 Raise Wrist To Wake Up The Screen, Raise your hand to brighten the screen without taping screen to see real-time states including sports data, time and heart rate. Long standby time, Xiaomi mi band 3 with ensures about 20 days ultra-long standby time for a full charging.