Using patent-pending calibration technology the new Acu-Rite comprehensive weather center automatically calculates your altitude over 14 days, increasing its forecasting accuracy.The All-in-one indoor unit displays indoor and outdoor temperatures and humidity levels; indoor comfort-level icon; 24-hour outdoor temperature and humidity records; barometric pressure, graphed trends, and history; day, date, and time; self-setting time, self-calibrating forecast depicted with 14 large weather icons; and momentary backlight. Sensor and display units feature hanging holes for wall mounting; display unit also features a removable base for tabletop use.Features: Indoor/Outdoor Temperature Min/Max Temperature Fahrenheit/Celsius Additional Channels Indoor/Outdoor Humidity Min/Max Humidity Atomic Clock/Date Future Weather Forecast Self-Calibrating Weather Forecast Barometric Pressure Reading Barometric Pressure History Chart Wireless RF Range Specifications: Transmission Range: 330ft (100M) Temperature Scale: Fahrenheit / Celsius Selectable Temperature Range (Indoor): 32° to 122° F Temperature Range (Outdoor): -40° to 158° F