Mi Band 3 is the third generation of Xiaomi's popular wearable device. The Mi Band 3 features a 0.78" 128x80 monochrome white PMOLED, a heart-rate sensor and NFC. The 110mAh battery is said to last over 20 days between charges.
The Mi Band 3 is now shipping globally for around $35 (note: affiliate link to Amazon).
0.78" 128x80 white PMOLED