This fan features a 6-blade design and a high-speed motor with up to 13,000 rpm. It offers 2 to 26 hours of use per charge and recharges in 3.5 hours via USB. It includes a rotary switch for stepless speed adjustment from 1 to 100 levels. Price drops from $9.99 to $4.99. Shipping is free for Prime members or on orders over $35.