Features: -There are 6 adjustable wind speeds, with the maximum wind speed reaching 3834 rpm and 4.5 m/s. -Equipped with a brushless motor that reduces noise levels to <20 dB, it is extremely quiet and non-intrusive. -Built-in 3600mAh rechargeable battery, speed 1 works for 20 hours, speed 2 works for 15 hours, speed 3 works for 10 hours, speed 4 works for 7 hours, speed 5 works for 5 hours, speed 6 works for 4 hours. -With LED screen, it can display the gear position and power level in real time so that it can be charged in time. -The handle can be folded to 180°, it can be used as a handheld fan, table fan, neck fan. -Suitable for home, office, school, outdoor camping, sports, etc. .