For use with the Breathe Easy Turbo Powered Air Purifying Respirator Assembly 520-17-00, Breathe Easy Turbo Powered Air Purifying Respirator Unit 022-00-03R01 and the Powerflow™ Face-Mounted Powered Air Purifying Respirator System. NIOSH approved with A, AE, E, K, P3 cartridges only. This intrinsically safe, rechargeable nickel cadmium (NiCd) battery pack can only be used with certain Cartridges and Filters. For the Breathe Easy System, choose one of the following cartridges/filter: Organic Vapour Cartridge 456-00-01R06, A Formaldehyde/Chlorine/Hydrogen Chloride/Sulfur Dioxide Cartridge 456-02-01R06, E Ammonia/Methylamine Cartridge 456-01-01R06, K Organic Vapour/Chlorine/Hydrogen Chloride/Sulfur Dioxide Cartridge 456-03-01R06, AE High Efficiency Cartridge 450-00-01R12, P3 For the Powerflow Powered Air Purifying Respirator System: High Efficiency Filter 450-01-01R20, SP3