Learless Neck Hanging Fan USB Rechargeable, Silent, Large Wind Lazy Person Portable Student Quad Core Fan Features: Youth needs to be floating, fully equipped with quadcore and silent! The wind is strong! Cool and refreshing back neck True 4-core technology allows for higher wind speeds, faster , and no entanglement in the hot and stuffy hair Feeling and Gentle with Three Winds, Fresh and Natural, Fast The wind speed of the front and rear independent fans is 10 times that of the 2 fans, and they are not afraid of cost. With 4 turbine blades, they are cool and sweat free The sound of the silencing motor is as low as 20dB, not afraid of cost. Four silencing materials are used to increase the wind power by Never been so quiet, my mood is really good. is not disturbing, and I can easily use it at work Equipped with 2400mAh energy-saving lithium- battery from morning to night, the range of the battery is sufficient for one day's use without getting too hot in the sun Product Description: size：218*140*41mm / 8.58*5.51*1.61in Conjunctive word:Neck Fan;Personal Fan;Bladeless Fan;Neck Fan Rechargeable;Tower Fan;Ventilador Portatil;Portable Fan Rechargeable;Neck Fans That Blow Cold Air;Portable Neck Fan;Small Fans Portable;Battery Operated Fan Learless Neck Hanging Fan USB Rechargeable, Silent, Large Wind Lazy Person Portable Student Quad Core Fan Lightweight design, convenient for travel and carrying Natural and cool, experiencing the comfort of a gentle breeze all day Short charging time, long battery life Low decibel noise, allowing you to comfortably enjoy the coolness in the office or library