Rechargeable Battery with High Capacity With secured rechargeable 3000 mAh lithium battery, works 3-10 hours on full charge, rechargeable for hundreds of times and ensures safe use. Compatible with USB port, charged via 5V output adapter. The rechargeable fan can also be charged via a USB charger, laptop, power bank, car power bank and other USB enabled devices. High quality material: mini fan is made of high quality ABS material. The PC fan is robust and durable. Hand fan can be placed in the hands and placed on the table. You can put it in bags or drawers when you don't use it. If you have any questions about our hand fan, please contact us in good time. We are happy to help you. 3-speed adjustable: the fan with 3 settings of the airflow speed can be adjusted to your requirements. Adjust the appropriate fan speed by repeatedly pressing the on / off button. Speed 1 is suitable for indoor use such as office; and speed 2 and 3 are suitable for outdoor use, it can be cooled in hot weather. Portable and lightweight, humanized hand fan design, foldable handle design, comfortable to hold, perfect for outdoor activities in the summer such as hiking, camping, fishing, hiking, ball game or vowel concert to observe Feel cool anytime! Less noise: for a powerful breeze with lower noise (between 20-30 dB). Fan USB keeps you cool while maintaining a minimum of noise so you can work, read or relax without distractions ..