Fan classification: hanging neck fan. Material: ABS. Motor type: Brushless motor. Number of blades: No blades. Power supply mode: battery. Whether built-in battery: built-in battery. Built-in battery capacity: 4000mAh. Wind speed gear: 3 gears. Mode of operation: Mechanical. Whether to support charging: support. Combination form: single piece. Color: white, blue. Appearance size: 21.5*18.5*5.5cm/8.46*7.28*2.17 inches.