Functions of the multifunctional 433 wireless transmission 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/switch;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), transmitter: 2 * AA battery(regular shipment does not include battery) 10. Low power reminder 11. °C/°F switch (default °F when powered on) 12. Connect up to 3 transmitters (regular package comes with three transmitters) 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 15. The transmitter is waterproof, waterproof level: IP4, can be exposed to rain 16. Humidity comfort reminder function 17. 24-hour temperature and humidity maximum and minimum value recording Parameters Indoor temperature measurement range: 14°F-122°F(-10°C-50°C) Outdoor temperature measurement range: -40°F-158°F(-40°C-70°C) Temperature resolution 0.1°C/°F Temperature accuracy: ±1°C/±1.8°F Humidity range: 20%-95% Humidity resolution: 1% Humidity accuracy: ±5%RH (within 30%-70%RH range) Temperature display unit: °C/°F optional Colour:White Material:ABS Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use