Xiaomi's Mi Band 4 is a fitness tracker that features a BOE 0.95" 240x120 AMOLED display a built-in microphone, an optional NFC and an improved 6-axis accelerometer.

Xiaomi Mi Band 4 photo

The Mi band will ship on June 14th in China, starting at 169 CNY (around $25 USD).

OLED type: 

0.95" 240x120 AMOLED display

Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters