· Provides a comfortable and Kräfteschonende support the respiratory system in combination with matching full mask or half mask and breathing filters with round thread connection · With Gutachterlicher Comment of the DEKRA exam according to DIN EN 12942: 2009 (fan filter unit) · Made from super high quality and Schlagfertigen materials (PVC-free) · The lightweight provides first-class comfort experience while added value of dependability · effectively fights build-up of heat in the mask · No annoying, unwanted and dangerous cable entanglement, as it is battery compartment directly installed in the housing · Can be used immediately thanks to the included battery pack (Pack 2 pcs 9 V block battery included? 1300 mAh