Easy to read, easy to program, and affordable. Data updates every 4 seconds giving you an accurate weather picture. Displays both outside and inside temperatures as well as a min/max temperature that can be reset at the touch of a button. Weather forecasting icons and weather tendency indicator is determined by a barometric pressure reading that causes the icon to change when a significant change in pressure occurs. Wireless sensor transmits weather data 330 feet and does not need to be by a window. Wall hanging or free standing. Requires 3 AA batteries for the receiver and 2 AA batteries for the sensor, sold separately.