The 5 speed works with aerodynamically air ducts for effortless comfortable, none complicated operations needed The built in LED display shows real time power condition, ideal for outdoor adventures, work, camping, or workouts Adopting a double motor double exhaust systems, combined with ergonomic 180° airflows vents, it has better cooling Equipped with a 20000mAh battery, this neck fan provides up to 32 hours of continuous cooling on low speed Combining waist airflows, neck circulation, desktop cooling, and portability power supply functions