Description: These 7-segment displays normally require 13 pins (5 characters and 8 total segments each). Solves the annoyance of using 13 pins or a bunch of chips by having an I2C constant-current matrix controller sit neatly on the back of the . The controller chip takes care of everything, drawing all the LEDs in the background. All you have to do is write data to it using the 2-pin I2C There are three pins so you can select one of 8 addresses to control up to 8 of these on a single 2-pin (as well as whatever other I2C chips or sensors you like). The driver chip can the entire display from 1/16 brightness up to full brightness in 1/16th steps. It can't individual LEDs, only the entire display at once. Specification: Size: Approx. 5.03 x 2.68 x 1.2 cm/2 x 1.1 x 0.5 inch Package Includes: 6 Pieces 0.56" 4 Digit LED Display Modules Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement. Description: These 7-segment displays normally require 13 pins (5 characters and 8 total segments each). Solves the annoyance of using 13 pins or a bunch of chips by having an I2C constant-current matrix controller sit neatly on the back of the . The controller chip takes care of everything, drawing all the LEDs in the background. All you have to do is write data to it using the 2-pin I2C There are three pins so you can select one of 8 addresses to control up to 8 of these on a single 2-pin (as well as whatever other I2C chips or sensors you like). The driver chip can the entire display from 1/16 brightness up to full brightness in 1/16th steps. It can't individual LEDs, only the entire display at once. Specification: Size: Approx. 5.03 x 2.68 x 1.2 cm/2 x 1.1 x 0.5 inch Package Includes: 6 Pieces 0.56" 4 Digit LED Display Modules Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.