The M11 Mini Fan (also known as the M11 Portable Turbofan) is a non warranty items  powerful handheld personal cooling device that replaces traditional 3-speed fans with a customizable, Dimension is  16.0 cm in height, 5.8 to 6.0 cm in width, and 5.5 to 5.9 cm instepless scroll wheel Featuring a high-torque brushless motor, it pushes wind speeds up to 9 m/s for instant, targeted relief .