|Description||OLED display 0.96″, resolution 128 x 64 pixels|
|I have paid||$3.12 / piece (free shipping)|
|Interface||I2C (there are SPI variants)|
|Colors / backlight||white / none|
|Memory card slot||no|
|Dimensions||board size: 27 x 27 mm, display area: 22 x 11 mm|
|Library||Arduino: Adafruit_SSD1306, u8glib|
Its price is about $3.5. I am not sure whether it is common behavior but my two pieces are producing slight high pitch noise. I hope that it is just some faulty series.