1. Dot Matrix: (1) Size: 8*8, 5*7, 0.7'', 1.3'', 1.5'', 1.9'', 2.3'', 3.0'', 4.0'' (2) Color: Single color / Bi-color / RGB color; Cathode or Anode 2. Digit: (1) Size: 0.3'', 0.4'', 0.5'', 0.6'', 0.8'', 1.0'', 1.2'', 1.5'', 1.8'', 2.0'', 2.3'', 3.0'', 4.0'', 5.0'', 7.0'' size (2) One digit, Two digit, Three digit, Four digit, Red/Green, Cathode/Anode 3. Cluster: (1) Size: 4*8, 8*8, 8*16, 16*16 (2) Color: 4*8(1R3G/4R/2R1G1B); 8*8(4R/2R1G/2R1G1B); 8*16(2R1G/2R1G1B)