1.5 inch 4 digit bus digital clock with temperature and date display, battery backup, low power, ... and liable pcb design 1.5 inch 4 digit bus digital clock with temperature and date display Master Features: 1. Dimensions: ... -10 ~ 70 , humidity from 0 to 90% 7.4 digital display, 1.5-inch high characters for the red LED ... no power supply 1.5 inch 4 digit bus digital clock with temperature and date display