Fan classification: hanging neck fan. Material: ABS. Motor type: Brushless motor. Number of blades: No blades. Power mode: USB. Whether built-in battery: built-in battery. Built-in battery capacity: 6000mAh. Wind speed gear: 3 gears. Operation mode: button. Noise: below 36dB (inclusive). Whether to support charging: support. Additional functions: cooling, heating, natural wind. Combination form: single piece. Color: black, white, cyan. Appearance size: 21*17.5*4.5cm/8.27*6.89*1.77 inches.