【Battery-Powered Fan】 This small portable fan features a built-in 7800mAh high-capacity battery that lasts 5 to 20 hours, providing long-lasting cooling. It is ideal for camping and barbecues. It has 4 indicator lights that show the battery level. 【Solar Fan】 This rechargeable fan is equipped with a solar panel. This solar panel is powered by a 2.4 amp battery and fully charges in just a few hours with bright light. It can also be used while charging, promoting a carbon-free lifestyle. Note: The fan and the solar panel must be separated during use. 【4 Adjustable Speeds】 This quiet fan uses the latest brushless motor technology and ultra-thin blades to deliver exceptional airflow and minimal noise. It offers 4 speeds (25%-50%-75%-100%). 【Other Functions】 The USB fan can be charged via a Type-C cable and can also be used as a portable charger to charge your phone in an emergency. 4 LEDs with 3 adjustable brightness levels are installed around the wireless fan. The timer function allows