Fan classification: hanging neck fan. Material: ABS+Silicone. Motor type: Brushless motor. Number of blades: No blades. Power mode: USB. Whether built-in battery: built-in battery. Built-in battery capacity: 4000mAh. Wind speed gear: 3 gears. Operation mode: button. Noise: 36-45dB (inclusive). Whether to support charging: support. Additional features: three light modes. Combination form: single piece. Color: blue gray, white. Appearance size: 20.5*18.3*5 cm/8.07*7.20*1.97 inches.