Original Xiaomi 0.42" OLED Display Touch Screen Mi Band 2 Heart Rate Monitor Smart Wristband - Black. A good helper for your daily life. Monitors pace, steps and heart rate while you're running. Precise heart rate monitoring, scientific self-control movement. Military-grade ADl sensor. Power-efficient ADI accelerometer, optical heart rate sensor. Resistant to acratches and fingerprints. Anodized 0.05mm ultra-thin button. 2nd generation Bluetooth 4.0 for faster, stable connections. Large capacity, long endurance. Call, App messages reminder you by vibration. Time, steps, heart rate close at hand, easy to touch. IP67 waterproof grade. You can wear it when you are swimming or showering, resistant to water, dust, corrosion. And buy this Xiaomi Mi Band 2 Smart Wristband w/ 0.42" OLED Touch Screen Now $21.93.