... 3.High brightness 4.Long life 7 segment LED digit display in blue color 4 digit Specifications: Size ... : 0.39 inch Voltage: 2.8-3.6V Wavelength: 462-470nm Various colors: blue ... Low power consumption, Excellently low current, High effecieny, Long life-span, , Luminous evenly distributed on each segment ... sizes are available: 0.24, 0.25, 0.31, 0.32, 0.36, 0.51, 0.56 ...