Features 1、ADJUSTABLE LED: 4 digit LED digital display module, the LED brightness is adjustable, which has a wide range of applications. 2、DURABLE DIGITAL TUBE: Using 2pcs 595 to drive the digital tube, needs MCU 3 way IO port, and the display is based on the digital tube dynamic scanning principle. 3、EASY INSTALLATION: The digital tube module has 4pcs M2 screw positioning holes with a diameter of 2.2mm, which is convenient for installation. 4、VOLTAGE AND CURRENT: The working voltage range is 3.3V‑5V, and the module current is 30‑80MA when the power supply is 5V, which is stable and reliable 5、WIDE APPLICATION: This digital display tube has a compact size and is equipped with jumpers, suitable for various electronic experiments. Specification Item Type: Digital Tube Module PCB Board Size: Approx. 38 x 22mm / 1.5 x 0.9in Module Current: 30-80MA (at 5V power supply) Package List 1 x Digital Tube Module 1 x Jumper