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Description: Advantages: ①It can protect formaldehyde, waste gas, droplets, pollen, second-hand smoke. ②DEHS (aerosol), fresh air module quality upgrade, nano-technology air layer fabric, can meet 8 hours of battery life, the air supply mode does not suffocate, no Hot and humid, no air leakage. specification: Appearance: stylish appearance, 3d thin face design, breathable and quick-drying Material: Double protection, worry-free and safer, custom module four-layer composite filter + high quality filtergrade built-in filter, 5-layer double melt-blown structure, filtration efficiency is greater than 99.5% Material: Non-woven contain: 1x mouth cover body 2x high quality filter filter 5x filter 1x breathing valve 1x charging cable 1x manual 1x outer box