rt20105

venuri mask In seven level: 24% 26% 28% 30% 35% 40% 50% Venturi mask·The oxygen concentration can be selected from 24% to 50% ·In seven level: 24% 26% 28% 30% 35% 40% 50% ·Mask with elastic strap ·Adjustable nose clip·Size :S, M, L, XL venturi mask