TriPole 4000mAh Rechargeable Desk Fan 31H Runtime, 4 Speed Portable USB Fan with LED Display, Battery Operated Ultra Quiet Table Fans, Head Adjustable for Office, Bedroom, Camping, Travel (Navy Blue)

• 4 Speed Powerful Cooling: This desk fan features 4 adjustable speed levels delivering airflow from 2m/s to 5.3m/s. Whether you need a gentle breeze for focus or powerful cooling on hot days, this usb fan keeps you comfortable at your desk or table
• Long Runtime & Battery Indicator: Built-in 4000mAh rechargeable battery provides up to 31hr of use on low speed and 5hr on high. The smart LED display shows real-time battery level, so you always know when to recharge and avoid unexpected power loss
• Ultra Quiet & 3-Level Ambient Light: The portable fan runs under 20dB on low speed, which keeps air flowing without disturbing conversation or sleep. Included ambient light with 3 adjustable brightness levels for cozy customized lighting
• Powerful Yet Compact: Measuring 5.3"L x 2.5"W x 6.5"H, the mini fan fits neatly on office desks and nightstands, taking up minimal room while delivering steady airflow. Versatile for indoor & outdoor use—perfect for cruises, train, airplane trips and camping
• 120° Adjustable & Easy to Clean: The fan head supports up to 120° vertical tilt, allowing you to direct airflow exactly where you want it. Detachable front grille makes cleaning quick and simple, keeping your table fan fresh and efficient
• Double Protection Design: There's a power switch on the back of this travel fan, preventing it from turning on in a bag unintentionally or to immediately turn it off. With this security lock, accidental activation will no longer occur

TriPole USB desk fan with built-in 4000mAh battery is convenient for use outdoors; the rechargeable fan keeps working for 5-31h. In addition, the plug-and-play office electric fan USB can be adapted to power bank, laptop, car adapter and so on.The small fan displays red light when charging, and turns green light when fully charged. 3.5H can be fully charged