These 6 units come with a built-in battery and is also charged by USB-AC plug. The hand-held operated Mist Application Nebulizer delivers the XYZENO Formula effortlessly with nose piece and/or mouthpiece for lung direct delivery. It will allow a 10-12 usage before internal battery need recharging. Placing XYZENO drops from each bottle in chamber along with 8-10 ml of 100% filtered or distilled water is the required treatment process. The user must follow the precise drops amounts into the pure water container for the exact treatment to occur. These bottles are 15mL and 40+ full session. This will allow up to 80+ Sessions for multi patients! Ideal for any Hospital or clinic size to handle patient inflow/outflow treatments. Or Families that want everyone to have their own unit!