Low noise and Smart control by touching the body case. Product Specifications: Model: VH104 Product Description: Smart USB Fan "Yu" (low noise) Size: Ø10 x 10 cm (Ø3.94 x 3.94in) Electric power supply: DC5V(fixed)500mA or above (supplied from USB port) Interface: USB 2.0/3.0 Weight: 290g (approximate) Color: Black, White Material: Metal Alloy, PP resin, PU Leather Switch Position Levels: High, Low (2 Levels) Air volume (m³/MIN): High 6.5, Low 5 Noise (db): High 34, Low 26 Length of USB cable: 1m/39.4in (approximate)