OMRON MicroAir Portable Mesh Nebulizer.The MicroAir U100 Nebulizer is a small, handheld battery-operated nebulizer. It uses unique, vibrating mesh technology with fast misting to help deliver the optimal amount of medication. Plus, it operates almost silently (less than a soft whisper at 23 dBA*) and can be held in any position with 360 operationlaying down or sitting up. Now youre free to travel wherever you want in comfort and treat symptoms discreetly.Includes: Main Unit, Main Unit Cover, Medication Container, Mesh Cap, Mask Adapter, Mouthpiece, 2 AA Batteries, Child Mask (PVC), Storage Case, Instruction Manual.