Input voltage: 220V Power: 20W Air flow: 140 m3/h Rotating speed: 2800 r/min There are 2 colors, white and black. It has quiet copper motor, the white square model is with anti-backflow vent, which is windproof.Suitable for small office, residence room, toilet, kitchen. You can prefer with calories cable or not. Only when you prefer fan with strength cable, it has thethe operate of ON/ OFF and speed control. If you choose with out power cable, there isn't any extra function. Note: the following length is measured by means of hand, will have a bit error, perhaps 5mm error, don't open dispute due to this.