Wireless Thermometer & 8451;/& 8457; Weather Station Digital Hygrometer Temperature Humidity Monitor with Forecast Sensor Magnetic Holder      Product Features:        Measuring indoor and outdoor temperature and humidity, Celsius and Fahrenheit conversion       Highest and lowest temperature humidity memory functio       View historical temperature and humidity data       Connect up to 3 outdoor units (package with one outdoor unit)       Two high magnetic magnets on the back of the main unit that can be attached to metal objects       The back of the main unit has a bracket that can stand in a horizontal position       High sensitivity touch button control for easy operation       Comfort indication, temperature and humidity trend indication       HTN large screen HD no-view LCD display       With backlight, the backlight is automatically turned off after 10 seconds without operation       The outdoor unit can be suspended by hanging holes or standing on a horizontal surface.       Outdoor unit XP4 waterproof        Product parameters:        Indoor temperature range: -4°F - 158°F (-20°C - 70°C)       Outdoor temperature range: -40°F - 158°F (-40°C-70°C)       Humidity range: 20%-95%       Comfort display: dry, comfortable, wet       Temperature display unit: °C / °F optional (default is °C)       Temperature resolution: 0.1 °C / °F       Humidity resolution: 1%       Refresh rate: 10 seconds.       Error: temperature is plus or minus 1 °C, humidity is plus or minus 5%       Wireless reception range: 60 meters / 197 feet       RF radio frequency: 433 MHz       Power supply: 2*AAA battery(shipping without battery)