Wide Temp & Humid Range: Indoor outdoor thermometer hydrometer measures indoor outdoor temperature and humidity percentages simultaneously; Indoor/outdoor temperature range: -4F to 158F (-20C to 70C); Humidity range: 20% to 99%. Wireless temperature and humidity monitor: Wireless thermohygrometer outdoor with signal penetration humidity sensors to get the temperature and humidity records from 328ft/100m remote range away(433 mhz). Max & Min Records: Indoor temperature and humidity with memory function can record the high/low temperature and humidity levels in the past 24 hours, so you can keep abreast of the current data, adjust a better and more comfortable environment, and build a healthier environment. Touchscreen Backlight Display: The digital room thermohygrometer gauge's bold numbers clearly display real-time data, making it easy to read even from a distance. You can switch between C/F according to your reading habits, and a simple touch can also turn on the backlight, making it easy to read even in dim conditions.