Fan Mask Features: - 3 Speed Fan - Built-in battery - 95% Filter Level - Adult Size - Male/Female Fan Mask Link: LYFY Fan-Powered MASK How the Lyfy Fan Mask works: Lyfy Fan Mask contains miniaturized fresh air module. Relying on the technology of composite electret fiber filtration, it has a filtering efficiency above 99% against PM2.5 particles. Deeply purified fresh air is injected into the mask by the miniaturized fresh-air module with proprietary technology. Through air circulating channel, unhealthy and humid exhaled air are propelled out of the mask. Miniaturized fresh-air module is a comprehensive solution to the shortness of breath and dampness problem from a traditional mask. Lyfy Fan Masks brings you a healthy and comfortable breathing experience. Lyfy micro air-circulation motor • made of food-grade PC material, quiet and ultra-thin. • three adjustable modes, the mask has a thin fan with 3 speeds ...