TWO POWER SOURCES- Longer Operating Time. Rechargeable battery or USB charging. The rechargeable usb fan comes with a 2600mAh rechargeable battery for longer using outdoors (2.5-6 hours depending on different speed). The battery need about 3 hours forfull charging. The desk fan with usb also powered by USB for indoors such as PCs, laptops or power banks, providing more convenience. NEW VERSION CLIP ON FAN & USB DESK FAN DUAL USE. Enhanced version unique base design,The usb fans desk can be placed on the desktop, or clipped to your office desk, and headboard securely, with a strong clip that fits boards within 5cm. The usb fansequip with rubber pads so it would not damage your furniture, and will not slip. SUPER SILENT & 360 DEGREE ROTATION- We use the brushless motor for this mini fan usb, the brushless motor make this fan very quiet when it's running. The usb fan with quiet operation, you can sleep comfortably without the noise disturbs you. Support360-degree horizontal and vertical rotation, adjust the direction of the wind with 360 up and down, left and right adjustment, you can enjoy the cool wind from all directions. 3 ADJUSTABLE SPEED USB DESK FAN- Our usb desk fan silent is with a single rock switch makes the operation simple and flexible. 3 mode from breeze to strong wind, speed 1 is the lowest wind, speed 2 is the medium and speed 3 is maximum. (Use powerful brushlessmotor, max speed is up to 3500r/min, low noise to 30-36db). Suitable for office, home, dorm, study,baby stroller, wheel chair, desk ,car or bed headboard etc for extra coolness on hot days. SAFE,COMPACT, LIGHTWEIGHT MINI DESK FAN- 5 inch portable frame saves your desk space, this usb mini fan is with safe ABS net cover, the grille is small enough, and use soft PP blades, so do not worry about finger-hurting by accidental, even safe for baby.effectively prevent accidental injury. 720 Degree Rotation Innovative design, can humanized adjustment of the rotating structure, and the rotating body is combined with the ring bracket and can be adjusted freely until it is right for your angle. Anti-Slip Bump + Non-Slip Mat There are anti-slip bump on the armrests to enhance friction. The inside of the clips has a soft anti-slip mat to prevent slipping and accidental scratching of the objects.The mesh and anti-slip mat design increase the friction at the bottom of the fanand can also be used as a desktop fan. And the clip tension is 1-5 cm, suitable for tables, strollers, car, bicycles, barbecues and so on. Removable Safety Cover The front cover of the fan can be easily disassembled for cleaning and ensuring healthy use. And the safety cover design prevents the fingers from reaching the inside of the fan, preventing accidental contact with the fan blades and causing accidentalinjury, so the child can use it with confidence.