These displays were used in old Nokia 5110/3310 mobile phones - when phones were still phones and not a portable brainwashing machine.
It's an 84x48 pixel monochrome LCD display with a build-in PCD8544 controller/driver. This version supports 3.3v as well as 5v and comes with headers soldered for your convenience.
These displays are small, only about 1.5" diagonal, but very readable and come with a backlight. This display is made of 84x48 individual pixels, so you can use it for graphics, text or bitmaps. These displays are inexpensive, easy to use, require only a few digital I/O pins and are fairly low power as well
To drive the display, you will need 3 to 5 digital output pins (depending on whether you want to manually control the chip select and reset lines). Another pin can be used to control (via on/off or PWM) the backlight - the backlight LEDs are wired to a transistor.
These beauties can be used with Arduino, Raspberry, nodeMCU and much more.
Please note: These screens are recycled from older cell phones so they often have tiny nicks or scratches. There's no such thing as a 'new' Nokia 5110 display, but the scratches are not noticeable when in use.
While you will find instructions galore on how to use PCD8544 devices with Arduino, there isn't much out there for nodeMCU ESP8266 on Lua. We wrote a little tip sheet for you guys here.