TM1638 MCU 8 Bit LED Digital Tube Keyboard Module Scan and Display ModuleFeature:1. Only need 3-wire control2. Adapts TM1638 digital tube drive chip.Common anode LED digital tube.3. Only need three common IO and could drive、no need MCU scan、save MCU sources.4. With 8 digital tube(including decimal point).5. (2*8 )16 buttons6. Support 8 degree brightness asjustment7. Size: 7 x 7cm (2.7'' x 2.7'')Package includes:1 x 8 Bits Keyboard5 x Dupont Line