Taylor Digital Inside / Outside Round Weather Forecaster is a full featured deluxe forecaster in white LED. The LED readout dims while on battery power to conserve energy and will illuminate once the backlight button is pressed. Gather temperature humidity and barometric readings - temperature and humidity memory. Calendar and alarm clock features are included as well. The base station can be paired with up to 3 remote sensors. Indoor Temp Range 32F/122F and 0C/50C and Outdoor Temp Range -4F/140F and -20C/60C alkaline batteries. -40F/140F and -40C/60C lithium batteries (not included).