Lorell 3-in-1 Desk Lamp HEPA Air Filters - HEPA air filter features a high-efficiency, particulate-absorbing design that effectively captures small particles for cleaner air quality. Long-lasting design works for up to half a year for cost-efficient performance. Easy-to-use design allows quick, simple replacement. Air filter is designed for the Lorell Three-in-One Desk Lamp (sold separately).