3M 7100035757 is a PAPR Assembly, designed to protect against the hazard of Silica. It does not include headgear and is not intrinsically safe. The standard size assembly has a battery life of 5.5 to 13 hours, powered by a rechargeable standard capacity lithium-ion battery. It offers protection against gas, particulate, and vapor. The assembly comes with a high durability belt for mounting and a belt-mounted breathing tube. Cartridge or filter are not included. All these features make it a reliable and efficient product made by 3M.