Item Type: 4 Digit Tube_x000D_ Material: PCB board_x000D_ Application: LED digital display_x000D_ Digits: 4 Digit 7 segment_x000D_ Controller: 74HC595_x000D_ Connection Module: 2 Pins connect to digital I O_x000D_ Use Library: TM1637.h_x000D_ Voltage: 5V_x000D_ Color: Blue 1ACCURATE WIRING BOARDS: 4 Digit tube is made of good quality PCB boards, possess accurate wiring and clear board paths 2EASY WIRING AND USE: LED segment display module is plug and play, no need for cumbersome wiring process, easy and fast to use 32 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 4TM1637 DRIVER CONTROLLER: Connection module is 2 pin to digital I O, adopt TM1637 controller, the voltage is 5V, come with stable display 5STABLE AND DURABLE: 4 Digit digital tube come with stable structure, excellent performance and long service life 1 x 4 Digit Tube 1 x Pin Header