Motor type: Brushless motor Wind speed gear: infinitely variable speed Operation mode: knob type Built-in battery capacity: 15000mAh or more Battery life: more than 12h Additional features: 100-speed stepless fan Number of fan blades: 6 and above Colour: dark gray Material: plastic Package Contents: 1*waist-mounted electric fan 1*data cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.