... brightness 4.Long life 0.56 inch 7segment 3 digit red LED display Specifications: Size: 0.56 inch, other size also ... .8'',1.5'',2.3'',2.5'',3'',4'',5'',,,,,,,,Voltage: 1.8-2.3vWavelength: 46630-640nmemmiting color: red.other emmiting colors are ...