This unit comes with 2 AA batteries and is also charged by USB or direct use. 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 6 to 8 times use before batteries 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 10mL and 40+ full session.NOTE: HIGH DEMAND WILL CAUSE US TO SUBSTITUTE WITH SIMILAR MODELS SHOWN!