The LED matrix module is a very useful and low-cost way to add a display to your electronic circuits. It has 16 pins to achieve a different combination to ON/OFF the LEDs. It fits properly into any standard solderless breadboard. It is a Great display for electrical and test equipment. The diameter of the Led is about 1.9 mm with a common Anode configuration which emits Red color. The Exact dimensions of this module are shown in the Schematic image. These Displays are always in high demand in the DIY community as well as in Industrial Projects due to their multipurpose uses and cheap cost.