Forecast w/ Tendency IN Temp & Humidity OUT Temp Dimensions: Receiver:5.4"" x 3.5" x 1.18" Sensor: 5.05 " x 1.5" x .83" All Features: Weather forecasting function with 3 weather icons and weather tendency indicator Wireless outdoor temperature (°F or °C) Monitors indoor temperature (°F or °C) Monitors indoor humidity (%RH) MIN/MAX value of temperature display with time and date of recording MIN/MAX value of humidity display Barometric tendency arrow Atomic time and date with manual setting Automatically updates for Daylight Saving Time (on/off option) Wall hanging or free standing Detachable stand included Specifications: Indoor humidity range: 1% to 99% Wireless outdoor temperature range: -39.8°F to +139.8°F Indoor temperature range: 14.1°F to 139.8 °F Transmission range: Up to 330 feet Transmission frequency: 915 MHz Swiss precision sensor Power Requirements: Receiver: 2 "AA" Alkaline batteries Wireless sensor: 2 "AA" Alkaline batteries