This is a complete system consisting of two vests and air pulse unit, two sets of hoses, a set of travel bags, a manual and quick start guide. Nothing else is needed to start treatments. These retail for about $3000. Purchased in 2021 , My mother said it helped her a lot, she could tell if she missed a treatment. This is to help loosen congestion in the lungs for people with lung disease such as COPD cystic fibrosis or bronchiectasis..call Michelle at show contact info