Description 4 digit blue alpha-numeric display with TTL, SPI or I2C Serial Interface Display numbers, most letters, and a few special characters Individual control of decimal points, apostrophe, and colon Baud rate and brightness values retained in non-volatile memory The 7-Segment Serial Display (Blue) can be controlled in one of three ways: Serial TTL communication, SPI serial communication or I2C serial. View more Dimensions 41mm x 23mm (1.6in x 0.9in) Links ZIP File