MAX7219 8x8 "the 64er" LED Dot Matrix display

LED Matrix Display With 64 (8x8) LEDs Control of all LEDs via a single data cable LED matrices to form a composite switchable The red glowing LED dots have a diameter of 3 mm and a 1 mm space between the module Operating voltage: 5 v dimensions: length 3.2 cm X 3.2 cm wide X 1.3 cm high 4 holes for 3 mm screws