Honeywell Weather Forecaster with Heat Index TE657W, Weather Station, Atomic Clock, Indoor/Outdoor Temperature, Humidity & Barometer No. 1 Choice of Homeowners - Honeywell provides innovative solutions that make 100 million homes around the world more comfortable and efficient; Lifestyle Design - presented in a comfortable style with soft touch keys; Easy to Read LCD with Backlight - for convenient night-time viewing (AC adapter included for continuous backlight) Self-Setting Clock via RF signal from the US Atomic Clock in Ft. Collins, Colorado - precise time within a millionth of a second guaranteed to automatically adjust to daylight; Weather forecast in eight large graphic icons - Sunny, slightly cloudy, cloudy, rain, heavy rainy, snow, heavy snowy and stormy; Indoor/Outdoor Temperature - displays remote and base unit temperatures simultaneously; Indoor/Outdoor Humidity - displays remote and base unit humidity with comfort level; Temperature and Humidity Memory - View indoor/outdoor temperature and humidity MAX/MIN readings; Heat Index - alerts you to the danger of heat attack Channel Switching - reports on conditions from up to 3 remote locations; Wireless Transmission - no need to drill holes or run wire; Temperature Alarm - wakes you up when your programmed temperature is reached; Programmable Ice Warning Alarm - rise early in case of snowy or icy weather condition; Atmospheric Pressure Chart - shows the pressure changes for the past 24 hours; Absolute Pressure Reading - tells you the present pressure condition Sunrise and Sunset - know when it is daylight and when it will be dark outside; Moon Phase - Display 8 scenarios are displayed from new moon to waning crescent; Dual Crescendo Alarm - you can set one alarm for weekdays and another for weekend; Snooze - gives you eight (programmable) more minutes of rest; Multilingual Weekday Display - displayed in English, German, French, Italian, Spanish and Dutch; Premium Gloss Piano-Black Finish - brings style to your home and office; Low Battery Indication - alerts you to low battery of main unit and wireless sensors; Wall Mount or Desktop Option - gives you great flexibility and fits anywhere Heat index - Uses temperature and relative humidity to determine how hot the air actually "feels"; Low battery indication; RF transmission frequency: 433 MHz; Maximum number of remote sensors: 3 (one included, additional sensors available upon request); Dimensions - Main unit: 8.58(L) x 4.53(H) x 1.18(D) in (218 x 115 x 30 mm) Remote sensor: 2.37(L) x 4(H) x 1(D) in (60 x 101 x 25 mm)