Features It adopts a brushless DC motor to quickly release fresh air, and adopts powerful turbine air guide technology to achieve air circulation and purification. With quiet operation below 30dB, it provides a comfortable and quiet sleeping environment. Can be used by connecting to any USB port, such as power bank/laptop/power adapter, etc. It can effectively purify 99% of the air, making your breathing healthier. The coverage width can reach up to 161 square feet (15 square meters), suitable for any space such as office, bedroom, office, kitchen, living room, bathroom, pet room, etc. Specification Colour: white Material: ABS .