Digit Shield 4-bit digital tube display mode fast digital tube module compatible with only 4 digital ports are occupied, and 4 digital tubes can be controlled to provide library files.Use with Control Board (this product does not include Control Board)highlight Digital tube, clear display built-in control circuit, occupying only 4 IO ports controllable 4-bit digital tube display including XIAOSHUDIAN for platform.Colour: blackMaterial: plasticPackage Contents:1 * Digital Tube ModuleOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.