This bladeless neck fan features turbocharging motor which not only delivers a strong wind of luxury coolness but also bring a ultra low-noise operation without disturbing others. Built-in 800mAh rechargeable battery provides up to 3 hours strong wind power. Neck fan rechargeable with USB cable (included) by power bank or AC adaptor or phone charger. 3 adjustable speed to adjust the proper fan speed to meet your needs.