For large quantities, please negotiate separately. Parameters of Yada dual-head air outlet fan: 1 piece weight: 900g, 1 piece weight: 20kg, 1 piece quantity: 20pcs Product size: 19.8×15.6*39.3cm Packaging size: 20.4×15.9×40.5cm Outer box size: 83*42.5*83cm Product color White, grey battery actual capacity: 3000. Product motor: pure copper brushless motor. Product shell material: ABS 3000 mah actual capacity. Fully charged one fan: First gear usage time: 8-9 hours; second gear usage time: 5-6 hours; third gear usage time: 4-5 hours. Simultaneous usage time of two fans: first gear usage time The usage time for the second gear is 4-5 hours: 3-4 hours; the usage time for the third gear is 2-3 hours