4 LED Matrix Displays, on a circuit Board The 64 (8x8) LEDs Control of all LEDs via a single data cable LED matrices to form a composite switchable The 32x8 LED composite Matrix measures 130 x 32 x 19.5 mm total of The red glowing LED dots have a diameter of 3 mm and a 1 mm space betweenROHS compliance https://elecena.pl/product/17485434/max7219-8x32-4-in-1-dot-matrix-led-display 2021-03-29 https://elecena.pl/product/17485434/max7219-8x32-4-in-1-dot-matrix-led-display 2022-03-03