Features: 1. High-Efficiency Laser FiltrationFeatures a 3-layer filter design with a purification efficiency of up to 99.97%, specifically designed for laser filtration.2. Quiet & Powerful PerformanceEquipped with a single-phase brushless motor, delivering strong suction and quiet operation with noise levels as low as ≤68dB.3. Long-Lasting ProtectionA single filter cartridge can operate continuously for approximately 40 hours (after replacing the primary and medium-efficiency filters), providing long-term protection.4. Quick & Easy ReplacementNo circuit disassembly required—replace the filter in just 3 simple steps within 5 minutes, saving time and effort. Packing List: 1* iKier Replaceable Filter for D4 Air Purifier