5 Pieces I2C Display Module 0.91 Inch I2C OLED Display Module Blue I2C OLED Screen Driver DC 3.3V~5V(Blue Display Color)

there are no headers soldered to the boards. i had to go out in the rain to get headers for $12 to solder them myself which adds about 80% costs to the item. there is also no manual for this product. the product is supposed to support 3.3v to 5v as claimed in title, but in fact it only supports 5v. i wasted a couple hours to find this out. the product works but it is very inconvenient to make it work.

These things are quite nice, especially for the price. As you can see in the pictures, I created a snap-on bezel for mine to make for a cleaner prototyping experience (file available at thingiverse, search for thing 4768895). The AdaFruit SSD1306 Arduino driver works great for these modules. You can also control with any I2C device, if you read the datasheet for the SSD1306, available on the internet. Make sure the copy down the specs from the description (or print) and keep with the parts for future reference. You can power and control this from 3V3 or 5V due to the integrated regulator... quite nice.