... brightness 4.Long life 0.56 inch 7segment 3 digit red LED display Specifications: Size: 0.56 inch, other ... '',0.36'',0.56'',0.8'',1.5'',2.3'',2.5'',3'',4'',5'',,,,,,,,Voltage: 1.8-2.3vWavelength: 46630-640nmemmiting ... of equipment/machine, smart mater, electronic balance, microwave oven, induction cooker