This is a 1602 LCD 16×2 Character LCD Display For Arduino Uno, Decimal, Duemilanove, and Free duino boards.

1602 16×2 Blue Character LCD Display For Arduino is a basic 16 character by 2 lines Alphanumeric display. This LCD 16×2 Character LCD Displayhas White text on a blue background. Utilizes the extremely common HD44780 parallel interface chipset. Interface code is freely available. You will need Minimum 6 general I/O pins to interface to this LCD screen. Includes LED backlight. Works in 4bit and 8 bit Mode.

Features :

16 Characters x 2 Lines
Blue Backlight
5×7 Dot Matrix Character + Cursor
HD44780 Equivalent LCD Controller/driver Built-In
4-bit or 8-bit MPU Interface
Standard Type
Works with almost any Microcontroller

Specifications:

Construction	COB (Chip-on-Board)
Display Format	16×2 Characters
Display Type	STN, Transflective, Positive
Controller	SPLC780D1 or equivalent controller
Interface	8-bit Parallel Interface
LCD Color	Black Text on Green Backlight
Backlight	LED
Viewing Direction	6 O’Clock
Driving Scheme	1/16 Duty Cycle, 1/5 Bias
Power Supply Voltage	5.0 V
VLCD Adjustable For Best Contrast	5.0 V (Vop.)
Operating Temperature	-20⁰C ~ 70⁰C
Storage Temperature	-30⁰C ~ 80⁰C

The board uses different pins than the Arduino example sketches, so to make the display work, use the following sequence of pins when starting the library:
Liquid Crystal lcd(8,9,4,5,6,7);
The buttons are connected to only one analogue input pin through resistors to give a different voltage for each button, thus saving on input and output pins. Reading the buttons is easy, and an example code is shown below.