Xiaomi's Mi Smart Band 6 is a fitness tracker that features a 1.56-inch 152×486 AMOLED display, several sensors including an SpO2 oxygen level sensor, a heart rate tracker and an optional NFC.

Xiaomi Mi Smart Band 6 photo

The Mi Smart Band 6 will ship soon in China starting at $35.

OLED type: 

1.56" 152×486 AMOLED

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Cambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDsCambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDs