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More document click to download: TM1638 Features: 1. Use AIP1638 (compatible with TM1638) digital tube driver chip 2. Only need 3 ordinary IO to drive, no need for mcu scanning, save mcu resources 3. With 8 8-segment digital tubes (including decimal point) the size of the digital tube is 0.56 ' red or green common negative digital tube 4. Support 8 levels of brightness adjustment, digital tube and LED use the same brightness 5. Supports cascading up to 6/4 modules with the same driver chip 6. Digital tube module: size 10.0 * 5.1 (cm) Package Included: 1 x TM1638 LED Module 8 Digit 8 Push Button Switch Module 1 x Cable