【Two Power Sources】-Longer running time. Rechargeable battery or USB charging. The USB rechargeable fan battery comes with a 2000mAh battery for extended outdoor use (2.5-6 hours depending on the speed). The battery needs about 3 hours for a full charge. This USB desk fan is also USB powered for interiors such as PCs, laptops or power banks. 【NEW VERSION CLIP ON FAN AND DUAL PURPOSE USB DESK FAN】-Unique upgraded version base design, the USB fans desk can be placed on the desk or attached to your desk and headboard in safely, with a strong clip that fits boards under 5cm. USB fans are equipped with rubber pads so as not to damage your furniture and prevent slipping. 【SUPER QUIET & 360 DEGREE ROTATION】- The brushless motor for this mini USB fan makes the fan very quiet when running. You can sleep comfortably without the noise bothering you. Supports rotation 360 degree horizontal and vertical, adjust the wind direction with 360° up and down, left and right adjustment, you can enjoy cool wind from all directions. 【3 ADJUSTABLE SPEEDS】- The silent USB desk fan has a single rocker switch, which makes operation simple and flexible. 3 modes of strong wind breeze, speed 1 is the weakest wind, speed 2 is the medium and speed 3 is maximum. (max speed is up to 3500r/min, low noise up to 30-36db) Suitable for office, home, dorm, stroller, wheelchair, desk, car or headboard, etc. 【SAFE, COMPACT AND LIGHTWEIGHT MINI DESKTOP FAN】- 5 inch portable frame saves space on your desk, this USB mini fan features a safe ABS mesh cover, the grille is quite small and uses blades made of Soft PP, so don't worry about hurting your fingers by accident, even safe for baby. Effectively prevents accidental injury.