This is a 40x4 LCD display made by JHD. It is based on the HD44870 display controller which makes it is easy to interface this LCD with most microcontrollers. It's extreme popularity ensures that no matter which microcontroller platform you are using, you will definitely find ready libraries to use this LCD. 

Technical Specification:

• Color of Display : Blue
• Color of Character : White
• Size : 40 x 4 (40 character x 4 rows)
• Input Voltage : +5V
• Supply Current : 3mA
• Board Dimensions : 190mm x 54mm (LxB)
• Display Dimensions : 148mm x 30mm (LxB)

Features:

• 40 characters wide, 4 rows
• White text on the blue background
• Single LED backlight included can be dimmed easily with a resistor or PWM
• Can be fully controlled with only 6 digital lines! (Any analog/digital pins can be used)

 Applications:

• Electronic equipment's
• Medical equipment's
• Fax machines
• Laser printers
• Industrial test equipment
• Networking equipment
• Smart homes