Illuminated color weather forecasting with Seasonal background changes; Adjustable intensity settings and programmable auto-dimming Indoor/outdoor temperature (°F/°C) & humidity (%RH); Set Custom Alerts and View HI/LO recorded values Barometric pressure readings with 24 hour historical graph 12/24 hour Atomic self-set Time and Calendar date Optional Add-on sensors (sold separately, compatible) for more data; Includes 5V power adapter (optional, 3 AA alkaline batteries for backup) Sensor requires 2 AA (batteries, not included)