1. Power supply: 3.7V/1000mAh 2. Operating temperature: 0 degrees Celsius to 45 degrees Celsius 3. Air volume measurement range: 0-999900CMM 4. Wind speed measurement range: 0-8800 feet/minute 5. Operating humidity: 40-85%RH 6. Storage humidity: 10%-90% 7. The handle can be stretched for long-distance measurement, and the length can be stretched to 533mm 8. Support five wind speed unit selections, manual/automatic shutdown 9. Support data retention, LCD backlight display
