Anti-virus full face maskProduct name: Self suction filter type anti virus full face mask Wearing method: head mounted adjustable. Life cycle: replaceable filter cartridge Interface specification: threaded port RD40 Screen: PC polycarbonate Material Mouth and nose mask: silicone Frame: ABS plastic Mask vision Total field of vision: 70% Binocular: 55% Below: 35% Lens transmittance: => 89% Mask leak rate: = <0. 05% Features: Protect industrial environmental pollutants such as