... operation, stable design for diverse applications 1.5 inch led digital clock circuit module with temperature, date displayMaster features.PCB dimension : 160mm ... °C; Relative humidity: 0~90%; 4-digit 7-segment LED digital display, digit size: 1.5 ” Available to display hours, minutes ... for 5 years when power interruption. 1.5 inch led digital clock circuit module with temperature, date display