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). Records minimum/maximum temperature with time and date of recording. Records minimum/maximum humidity with time and date of recording. Barometric tendency arrow. Barometric pressure with 12 hour history graph (in inHg or hPa). Indoor comfort level icon. Atomic time and date with manual setting. Automatically updates for Daylight Saving Time (On/Off option). 12/24 hour time display. Perpetual calendar. Time zone setting. Wall hanging or free standing. Detachable stand included. Swiss precision sensor - indoor humidity range: 1% to 99%. Outdoor temperature range: -21.8 F. to +157.8 F. Indoor temperature range: 14.2 F. to 139.8 F. Temperature accuracy: +/- 1.5 F. Transmission range: Up to 330'. Transmission frequency: 433.02 MHz. Swiss precision sensor. Compatible sensors: TX3U and TX3UP. Power requirements: Receiver: 2 ''AA'' alkaline batteries. Wireless sensor: 2 ''AA'' alkaline batteries.