Fan classification: hanging neck fan. Shell material: ABS. Power supply mode: USB. Whether built-in battery: built-in battery. Built-in battery capacity: 6000mAh. Wind speed gear: 4 gears. Operation method: button. Noise: below 36dB. Whether to support charging: support. Charging indication: The indicator light flashes when charging, and the indicator light turns off when fully charged. Combination form: single piece. Color: black, white. Appearance size: 19.8*15.9*5.3cm/7.80*6.26*2.09 inches.