Improved Ersion Mini USB fan, equipped with a copper core electric motor, to operate in a stable and low temperature frame. No rust, less friction. Silent table fan 3 Speed modes, ultra-silent (40 dB approach). Maximum wind speed up to 24.38 m / s for large volume of air with silence, and energy saving function Type of clip and table, perfect fan for the desk, the house, the dormitory, library, cars, camping, travel, gym, etc. Tilt and pivoting at 360 , adjust the air at any desired angle The energy is supplied in 2 ways: by a rechargeable 2200mAh battery (included), works between 2.5 and 6 hours depending on the frequency you use. And being connected via a USB cable (included) in a fast speed reload mode Product Name: Mini USB Fan Material Quality: ABS / silicone / electronic components Input voltage: 5.0 V Output voltage: 5.0 V-8.5 Nominal power: USB-2W Air volume speed: 3 speeds Battery capacity: 5000mAh polymer lithium battery Product size: 161 * 70 * 185mm Gift box size: 164x73x187mm Size of the outer box: 620 * 495 * 495mm Simple net weight: 400g Style / Color: Black Official accessories: host + 1 polymer battery + 1 USB cable USB cable length: 80 cm Lifetime: about 8 hours maximum, about 30 hours minimum Engine speed: The maximum wind power is about 3,100 rpm, the wind power minimum is about 2,350 rpm