Nitecore NEF20 Multipurpose Portable Fan Built-in 4,000mAh Battery Features: Ergonomically-shaped bladeless neck fan provides easy operation and added comfort 3 levels of wind speed available, with the airflow rate up to 170 L/min Dual turbine motors for more airflow amount 360° air supply angle Built-in 4,000mAh Li-ion battery with a max runtime of 16 hours Intelligent Li-ion battery charging circuit with a USB-C charging port Made from durable ABS material Capacity: 4,000mAh Rated Input: 4W MAX Charging Time: 5h (Charged via the 5V/2A Adapter) Rotational Speed: 3,900 RPM Runtime of the Fan: LOW: 16h | MID: 6h | HIGH: 4h Dimensions: 219.7mm x 202.7mm x 63mm Weight: 304±5g Package Includes: 1 x Nitecore NEF20 Multipurpose Portable Fan Built-in 4,000mAh Battery 1 x USB-C Charging Cable 1 x User Manual Warranty: 1 Year Warranty from date of purchase against manufacturing defect. Accessories (such as pocket clip, lanyards, holsters, etc), normal wear and tear, drop & water damages is not covered, nor is damage resulting from abuse, neglect, battery leakage or altering this product from its original state.