3 SpeedsAdjust appropriate fan speed by pressing the power button repeatedly. large capacity batteries provide 4-16 working hours duration (depend on different speeds). Hands Free DesignFashion style makes you look so cool and you can take it anywhere in hot weather to free your hands anywhere. Air OutletThe air outlets can blow air to your entire face around and keep you cool the whole day in hot weather Low noise designThis neck fan made of Eco-friendly ABS and silicone. Makes the hands free neckband fan softer and more durable and quieter. The wearable neckband fans motor has been modified so that noises of at least 25 dB can be generated while running. Compact designPersonal neck fans weigh about 10.1OZ and are ultra-light, put less strain on the neck.