Indoor outdoor thermometer hygrometer wireless weather station with large LCD display measures the real-time temperature and humidity with past 24 hours Max/Min records and trends arrows. Assess historical data and refer to the Comfort Indicator to quickly know your home living conditions. Works with the hi/lo temperature and humidity alert function, helps create a healthier lifestyle. Wireless indoor outdoor thermometer with remote sensors support to be connected to display temperature and humidity readings from 4 different places simultaneously up to 200FT/60M apart (Wireless Frequency: 433 MHz). Monitor your whole home, basement, or greenhouse confidently with our digital temperature humidity meter. Indoor outdoor temperature and humidity monitor measures inside temperature from 50°F ~ 140°F(-10°C ~ 60°C) , and outside temperature from -58°F ~ 158°F(-50°C ~ 70°C) with ± 1.8°F /1°C accuracy. The indoor and outdoor humidity range is 20%-95% with ± 5% accuracy. (Wet: humidity﹥70%; COM: 40%≤humidity≤70% & 20°C≤Temperature≤28°C); DRY: humidity﹤40%. )