Welcome to our shop! This is a basic 4-digit 7-segment LED display tube module. It is suitable for Arduino use with the library TM1637.h. The module is connected to digital I/O via 2 pins. It is designed with 4 mounting holes for easy installation. The LED display tube module is made of high-quality electronic components, ensuring stable and reliable performance. Product Details: - Item Type: LED Display Tube Module - Luminous Color: Red, Yellow, Blue, Green (Optional) - Rated Voltage: 5V - Gross Weight: 17g / 0.6oz (approx.) - Product Detail: 0.36 inches, 4 digits, common anode, LED high brightness digital tube Please note that the package includes 1 x LED Display Tube Module. 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.