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