[5-speed Adjustable] F11 mini handheld fan has a button on the right side, each short can adjust the size of the wind power, the wind to 2.5-4.6m/s, the revolutions per minute up to 2600-4500. Powerful and easy to use. [2400mAh Battery]The F11 Handheld Portable Fan's battery takes only 3 hours to fully charge once and gives you up to 12 hours of cooling time. Keeps you out of the heat whether you're outdoors or indoors! High endurance and efficient work. [ Design]Our small fan rotates at a 180-degree angle, and can be used hand-held when traveling outdoors or hung around the neck with a string; when used or in the office, it can be freely adjusted to the right angle by placing it on the table. [Intelligent LCD Display]When you the button, the display show you the current wind strength , and when it is idle, it show you the current power level, providing you with an accurate value. [Quiet & Undisturbed]During normal use, the noise is about 20-40 decibels, which is slightly louder than when you sleep at night and slightly less than when you communicate with your friends on a daily basis. Material: plastic colour: black Package Contents: 2 * Portable Personal Fan Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.