1. Features a multi-layer composite filter material with a three-dimensional structure for greater capacity 2. Achieves a filtration efficiency of up to 99.5% for particles as small as 0.3 μm, making it more suitable for allergy sufferers 3. Undergone long-lasting antibacterial treatment to provide better antibacterial effects during prolonged use 4. Automatically seals when removed, ensuring users do not come into contact with bacteria in dust throughout use 5. Friendly reminder: please store in a cool, dry place and avoid direct sunlight 6. Package contents: base station dust bag x 3 7. Volume: about 2.4 liters
