As an alternative to the more intricate dot matrix displays, a seven-segment display (SSD), also known as a seven-segment indicator, is a type of electronic display device for displaying decimal numerals. Digital clocks frequently use seven-segment displays. Digital clocks, electronic meters, simple calculators, and other electronic devices that show numerical data frequently use seven-segment displays. Qualities: 4 volts is the forward voltage. Height of digit: 2.3 inches Red is the color that is emitted. Black is the surface color. Intensity of Light: 100/200 mcd PCB Common Cathode Polarity Temperature range for operation: -35 to +85°C One 7-segment LED display is included in the kit. 2.3-inch C.C.