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Overview and Specifications:

Product Attribute
Accessory Type : Extension Board
Compatible With : Arduino.ARM

On-board 2 road 74HC164 serial to parallel chips
On-board 2 road 0.36 inch red common positive 4 bit 8 segment digital tube
On-board concatenated control interface, convenient external device to connect
Working Voltage: 5V
Board Dimensions: 35.3 x 29 mm