This USB adjustable speed welding fume absorber is a must-have for anyone who needs to keep their workspace clean and protected from harmful fumes. Featuring adjustable speed settings, plastic construction and ducting, this extractor fan is versatile and easy to use. It is for amateurs, DIY enthusiasts, and professionals who use soldering irons or other smoke-generating tools. Use it in the kitchen, bathroom or workshop to keep the air clean. Whether you're working on a small or large project, this extractor fan keep you comfortable and productive all day long. Can be connected to a pipe with a diameter of 8cm.(Note: Only the fan, not the duct.) Power supply:USB5V Power:5W Noise:50-70 db-A Product use precautions: 1. You must use a power bank and mobile phone charger with 5V2A or above, otherwise the insufficient power of the USB power supply cause the motor to work weakly or even fail to start! 2. Do not insert foreign objects into a rotating fan, which may easily damage the fan blades. Colour:Black Material:Plastic+Metal Package Contents: 1 * USB Fan 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.