Electronic Vibrating Mesh Technology (V.M.T.) creates a dense therapeutic aerosol by the movement of medication through a metal alloy mesh. Small and lightweight for easy portability. 98% medication delivery. Universal adapter for masks and T-pieces. Detachable head for easy cleaning. Includes main power unit, unit cover, medication cup, mesh cap, mouthpiece / mask adapter, mouthpiece, instructional video and carrying case. Optional AC adapter not included. Weighs 6 oz. Uses two AA batteries (not included). 2-year limited warranty.