This is 0.54" 14 segment common cathode LED and the color is amber. It can display more characters then 7 segment LEDs, include letters and numbers. It is compatible with bread board and can work with Arduino by adding some current limiting resistors. So, it Suitable for people who is newbie of electronic. Note: It just a segment LED without control chip. Corresponding Interface: High intensity and reliability High quality,low power requirement and low cost IC compatible ,easy assembly ESD 2000V Specification： 0.54 Inch dual digits display common cathode black face ,white segment Luminous Color: Amber Chips Materials: AlGaInP For any technical support or suggestion, please kindly go to our forum.