(Designed by Altronics) These 210 x 110mm jumbo digits are made from PCB and can be daisychained together into an array of numbers for counter and clock projects (linking board included). Each board is fitted with 74HC595 8 bit serial shift register chip and can be driven by Arduino ShiftOut. Aux output is provided for driving a decimal point/colon. Build yourself a sales counter, a ‘now serving’ counter or just a regular time clock. Red LEDs.