How to use Broad Airpro mask

Always wash your hands before wear the Airpro mask;
1.Tighten the armband to your arm, velcro side face out;
2.Connect air tube to airpro unit
3.Remove the joint from air tube;
4.Install joint on mask and connect air tube
5.Stick Airpro to armband;
6.Wear mask and extend the length if need
7.DIY mask if need.