Description: 35dB mute frequency modulation, no disturbance. USB charging, cable length 1.3m, can fit all adaptors. Double-layer activated carbon, high-efficiency filtration. HEPA Filter need to be cleaned once a month, and change it off within 2 years. The frosted hand feels more tasteful. An essential for the bedroom to have a calm and soft sleep. Especially suitable for people in autumn and winter, dry weather, people who are allergic to the smell of smoke, people with bronchitis, sinusitis, Cars, Trucks, etc. Can effectively remove CO2, PM2.5, 99.98% flower , 99% , CO2, dust, smoke, haze, peculiar smell, cooking oil, TVOC, etc., to purify indoor air. Specification: Noise:35dB Power: 8W Voltage: 5V Material: ABS USB Cable Length: 130cm Application Area: 21-30 sq meters Size Chart: 11.2x11.3x17cm/4.41x4.45x6.69inch Package Includes: 1 Piece Air Purifier 1 Piece USB Cable Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!