The USB mini fan is of detachable design, and it is lightweight and pocket-size, easy carrying and using, especially while traveling anywhere at any time. Actual test 2000 mAh batteries can be used for up to 10 hours, Provide you with cool for a long time. Silicone material safety and environmental protection, and can be bent at an angle and the direction you want. DO NOT touch the fan blades with your hands and DO NOT try to stop the blades while using. DO NOT keep the fan too colse to your face, eyes and hair. Please turn off the fan after a long time woking.It is best to turn off the fan for 10 minutes break after 2 hours continuous working. NOT fits for children under 8 years old.