UPGRADE AIR VOLUME - INCREASE 70% Upgrade neck fan use innovative turbo fan blades and wind hole design, increase 70% air volume, make you cool down quickly in 3 seconds.4000mAh HIGH CAPACITY BATTERY & 4-16 RUNNING HRS Built-in 4000mAh battery provides UP to16 hours of operating time. The portable fan need only 4 hours to be fully charged.ULTRA QUIET & BLADELESS SAFE The USB fan for neck adopts latest noise reduction technology, utral quiet. Bladeless neck fan can be used safely by children & the elderly. Do not worry about your hair getting caught.3 ADJUSTABLE SPEEDS & FREE YOUR HANDS You can press the power button to adjust the proper fan speed of the neckfan to meet your needs. Personal fan was designed as a headphone to free your hands; The fashion style makes you look cool in the crowd. Wearable neck fan is lightweight, easy to carry.PRACTICAL & NO-WORRY SHOPPING Rechargeable neck fan for men is ideal for office indoor outdoor work, gym, walking, driving, traveling, camping, etc.