Specifications:– Only need 3-wire control.– Adapts TM1638 digital tube drive chip. Common anode LED digital tube.– Only need three common IO and could drive, no need MCU scan, save MCU sources.– With 8 8 digital tube (including decimal point).– 2*8 16 buttons.– Support 8 degree brightness adjustment.– Weight: 34 g– Size: About 70mm x 70mmPackage Included:1 x TM1638 16 Buttons Display Module with pin cable