Product Description: Silent Home Air Purifier with True HEPA Filter Key Features: Ideal for creating a quiet and comfortable sleeping environment. Reduces the impact of secondhand smoke and allergens. Purification Technology: 5 layers of purification: negative ions, pre-filter, HEPA filter, silver ions, and PM2.5 filtration capturing particles as small as 0.3 microns. Size & Coverage: Dimensions: 5.9" x 5.9" x 3.9" Covers up to 200 square feet, suitable for various settings (Gym, SPA, Home, Office, etc.). HEPA Filter: Size: 4.3" x 4.3" (L x W) Lasts 3-6 months depending on air quality and usage. Remove the HEPA plastic bag before operation. Special Functions: Timer off function: 1 hour/3 hours/8 hours. 3-stage speed settings: High/Medium/Low for various conditions. Battery & Power: Built-in 8000mAh Li-ion battery (powered by 4 AA+ batteries). Charging time: Approximately 8 hours. Working time: 8-10 hours. Power supply options: Internal battery or external USB cable. Includes Micro USB interface (input: 5V2A) for charging. Usage Instructions: Before running, ensure the HEPA filter's plastic bag is removed. Package Contents: 1 x Air Purifier 1 x HEPA Filter 1 x USB Cable 1 x User Manual Note: The device is designed for quiet operation and energy-efficient cleaning. For best performance, use in an area with moderate air quality.