Fangrui Product Details Functions Of The Multifunctional 433 Wireless Mission Thermometer And Hygrometer:1. Indoor And Outdoor Temperature And Humidity Display 2. Memory Function Of The Highest And Lowest Temperature And Humidity Within 24 Hours 3. Backlight (touch And Turn Off For 10 Seconds, Plug In And It Can Stay On) 4. Air Pressure 5. Channel Search/ ;6. Bracket, Can Be Placed On The Table;7. Hanging Hole, Can Be Hung;8. Weather Forecast (predict The Weather Change Trend In The Next 24 Hours) 9. Power Supply Method: Receiver: Pluggable (type-c Charging Cable) 3 * Aaa Battery(regular Shipment Does Not Include Battery), Mitter: 2 * Aa Battery(regular Shipment Does Not Include Battery) 10. Low Power Reminder 11. C/f (default F When Powered On) 12. Connect Up To 3 Mitters (regular Package Comes With Three Mitters) 13. Temperature And Humidity Change Trend Indication 14. Wireless Receiving Range: 328ft/100m (open Space), Receiving Frequency: 433mhz. The Actual Receiving Distance Is Subject To The Actual Use Scenario Crafted With Attention To Detail