This is a popular 16×2 ?LCD With Blue Backlight??display. It is based on the HD 44870 display controller which makes it is easy to interface this LCD most micro-controllers. Its extreme popularity ensures that no matter which micro controller platform you are using, you will definitely find ready libraries to use this LCD.
It works of 5v and has a blue backlight which can be switched on and off as desired. The contrast of the screen can also be controlled by varying the voltage at the contrast control pin (pin 3).