The ZenWatch is an Android Wear smart watch that features a 1.63" 320x320 AMOLED display, a 1.2 Ghz CPU, 512MB of RAM, 4GB of storage and a battery that should last over a day. It also features a heart rate sensor.

The ZenWatch is available on Amazon for around $200. 

OLED type: 

1.63" 320x320 AMOLED