This fan offers stepless airflow adjustment from a gentle breeze to strong turbo. It features a 3600mAh rechargeable battery providing up to 12 hours of cooling on low speed. Weighing 6.7 oz, it folds to a compact size of 4.21 × 2.20 × 2.95 inches for easy portability. Price drops from $17.99 to $15.99 to $9.59 with code "2EJVUQ74" or  "ESZNZZLS". Shipping is free for Prime members or free over $35.