1. Power supply: 3.7V/1000mAh2. Operating temperature: 0 degrees Celsius to 45 degrees Celsius3. Air volume measurement range: 0-999900CMM4. Wind speed measurement range: 0-8800 feet/minute5. Operating humidity: 40-85%RH6. Storage humidity: 10%-90%7. The handle can be stretched for long-distance measurement, and the length can be stretched to 533mm8. Support five wind speed unit selections, manual/automatic shutdown9. Support data retention, LCD backlight displaySpecification: Package Weight One Package Weight 0.12kgs / 0.26lb One Package Size 33cm * 24cm * 9cm / 12.99inch * 9.45inch * 3.54inch Qty per Carton 20 Carton Weight 23.40kgs / 51.59lb Carton Size 68cm * 50cm * 47cm / 26.77inch * 19.69inch * 18.5inch Loading Container 20GP: 166 cartons * 20 pcs = 3320 pcs 40HQ: 387 cartons * 20 pcs = 7740 pcs