Feature: 1. ACCURATE WIRING BOARDS: 4 Digit tube is made of good quality PCB boards, possess accurate wiring and clear board paths 2. EASY WIRING AND USE: LED segment display module is plug and play, no need for cumbersome wiring process, easy and fast to use 3. 2 PIN CONNECTION: This is a basic 4 digit 7 segment display module, the display screen show each decimal point, the module is connected to digital I O via 2 pins 4. TM1637 DRIVER CONTROLLER: Connection module is 2 pin to digital I O, adopt TM1637 controller, the voltage is 5V, come with stable display 5. STABLE AND : 4 Digit digital tube come with stable structure, excellent performance and long service life Specification: Item Type: 4 Digit Tube Material: PCB board Application: LED digital display Digits: 4 Digit 7 segment Controller: 74HC595 Connection Module: 2 Pins connect to digital I O Use Library: TM1637.h Voltage: 5V Color: Blue Package List: 1 x 4 Digit Tube 1 x Pin Header