Fitbit's Charge is a fitness tracker and sleep tracker that also connects to your phone to show caller-ID. The Charge uses a small monochrome (white) PMOLED display (made by WiseChip). The Charge HR is similar to the Charge but with a heart-rate monitor.

The Charge is now available for $130. The Charge HR will launch in early 2015 for $150.

OLED type: 


Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters