0.56 inch ( 14.2 mm ) FOUR-DIGIT numeric LED displays Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer 4个双位LED数码 Four Dual Digit LED numeric Display 4个双位LED数码 0.56 inch ( 14.2 mm ) FOUR-DIGIT numeric LED displays 0.56英寸4.2毫米)的4位数字LED显示 Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer