Specification Indoor Temperature Range 20°C to 70°C 4°F to 158°F Outdoor Temperature Range 40°C to 70°C 40°F to 158°F Humidity Range 20 95 Comfort Indicators Dry Comfortable HumidTemperature Display Units °C °F Selectable default °C Temperature Resolution 0 1°C °FHumidity Resolution 1 Refresh Rate 10 secondsAccuracy Temperature ±1°C Humidity ±5 Wireless Reception Range 60 meters 197 feet RF Wireless Frequency 433 MHzPower Source Requires 7th Gen Batteries Batteries not included in standard shipment Features 1 Dual Temperature and Humidity Monitoring Measure indoor and outdoor temperature and humidity in both Celsius and Fahrenheit with a wide range of measurement options 2 Memory Function Records the highest and lowest temperature and humidity readings for reference allowing you to track fluctuations easily 3 Historical Data Viewing View historical temperature and humidity data to analyze trends and patterns over time 4 Multi Device Connectivity Connect up to three outdoor transmitters one outdoor transmitter included in standard package for comprehensive monitoring 5 User Friendly Design Equipped with high sensitivity touch buttons for easy operation Features a comfortable reading display temperature and humidity trend indicators and a high definition color LCD screen Package Include Wireless Thermometerx 1Transmitter x 1Pearl Cotton Bag x 2English Manual x 1