500FT Remote Range & Monitor 4 Locations: Hygrometer indoor thermometer outdoor measures temperature & humidity from 500FT away, track environmental conditions in up to 4 locations with additional temperature sensors; Search B08M8YLNNS to purchase additional sensors Cold-resistant & Waterproof: Temperature Humidity Gauge features completely sealed remote sensor contains rechargeable lithium battery to monitor temp and humidity as low as -31°F/-35°C, assuring transmission in rain or snow Accurate Readings: Greenhouse thermometer with wireless temperature sensor provides accurate humidity and temperature readings, accuracy is up to ±2℉and ±2~3%RH; Fahrenheit and Celsius can be switched Large Backlit LCD with Touch Button: Thermometer indoor outdoor with touchable backlight make it easily to read in dim light; Indoor-outdoor thermometer wireless displays current temp and humidity readings includes trend arrows, Max & Min records for all time/24 hours, keeping you aware of the slightest changes in your living conditions Multiple Mounting Options: Indoor/outdoor thermometer wireless features multiple placement options: A tabletop stand for various surfaces, magnetic back for different iron surfaces, and hang hole for wall-mount, convenient for you to put it anywhere