The real-real about wearing any gas mask is that they are excruciatingly uncomfortable, especially after a short period of time when they cause the wearer to start. Not so with this battery powered Turbo Fan Mask. This unused Adult size Gas Mask with Turbo Fan cools your face and creates a constant positive pressure inside the mask that prevents any introduction of the environment into the mask. Even if the mask seal is momentarily breached by accidentally or purposely lifting the face mask. The pressurized air inside the mask escapes out and nothing gets in. The air flow created by the turbo blower unit is like a moderate gentle breeze that won’t dry out your eyes. The premium 3M FR-57 filter cartridge with universal NATO 40mm mounting traps chemical, biological, nerve gas and nuclear fallout particulates. The FR-57 filter show an expired date, but are still factory vacuum sealed and fully functional. The Turbo Fan is used but I personally powered it with the BP-15 battery for 8 hours & is 3M built to be fail-safe. The fully charged long lasting (8hrs) 3M BP-15 battery is industrial grade and a correct 3M BC-210 charger is included. Especially since the 3M smart charger knows to switch to maintain charge mode. This 4 piece Powered Air Purifying Respirator “TURBO FAN” attachment is ready to use and is absolutely the most comfortable method of wearing your gas mask. I also have just the Turbo Fan, battery, etc.