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: whiteMaterial: ABSVoltage: DC 5V-9VNoise: ≦30dBSize: 4.5*4.5*6.9 inchesAir purified speed: 50 cube meters per hourApplication area: 11-15 square .