Small In Size, Big On FunctionCombined with USB Fan + Battery Operated Fan + Backup Power Bank function, small desk fan would be an everyday-carry-essential fan to cool you off in hot day and is multifunctional to satisfy your diverse needs.7.5-23 Hours Cooling TimeUp to 23 hours cooling time in one full charge with battery mode OR USB mode for no stop working. 4000mAh battery powered fan allows you to enjoy it while travelling, sleeping, working and any other indoor or outdoor activities.4 Speed Adjustable WindExperience customizable cooling and comfort with the 4 speed settings of our rechargeable fan portable. From a gentle breeze to a powerful gust, each airflow is thoughtfully crafted to cater to your needs. Especially the 4th speed variable frequency wind can provide the closest natural wind.Ultra Quiet Portable FanSize: 6.6x5.6x1.5 inches, weight: 9.3 oz, and foldable fan bracket making our small fan more easy to carry. Plus, the max noise of quiet table fan less than 35 db, it won't disturb working, studying, sleeping and meeting.Easy to Clean, Emergency ChargingHave you ever experienced the desktop fan is inconvenient to clean or cellphone is out of battery at important moments? If so, then our personal fan is a better choice. With a detachable fan frame and emergency charging design, it will bring you more convenience.High-end and DurableLeading structure, appearance design, premium materials, strict quality inspection and appearance treatment process make this table fan easy to use, sturdy and beautiful. The large air inlet and outlet fan frames structure achieves maximum air intake for fast cooling from all angles.