Compact Micro-Air Electronic Nebulizer If you have bronchial asthma or chronic obstructive pulmonary diseases such as emphysema or chronic bronchitis , choose this, the smallest nebulizer available with vibrating mesh technology. This Omron NE-U22 is a quiet, powerful, portable nebuliser and can be operated on either a battery os an AC adapter (not included). 98 per cent medication delivery. The NE-U22V is the smallest nebulizer with V.M.T. (Vibrating Mesh Technology) and unsurpassed aerosol delivery. Quiet, small, and lightweight, pediatric asthma patients respond well to this unit. Adults with asthma and parents of asthmatics easily carry this unit in handbag, backpack, or briefcase. Truly asthma treatment made as simple as possible. Note: Physician's prescription required prior to shipping nebulizers to customers in the USA per Federal Law. Metal alloy mesh cap for durability 98% medication delivery Universal adaptor for masks and T-pieces Lightweight and portable - weighs only6 ounces with batteries Low power consumption - 4 hours with continuous use, 8 hours when used about 30 minutes a day when alkaline batteries are used. Smallest size of any electronic nebulizer Quiet, powerful operation Ideal for pediatric asthma treatment Use it anywhere - home, plane, car or in school Detachable nebulizer head for easy cleaning Operates on: 2 'AA' alkaline batteries (not included) AC adaptor (not included) 2 'AA' NiMH batteries (not included) Contents: Main Power Unit (battery operated) Medication Bottle Mesh cap Mouthpiece/Mask attachment Mouthpiece Carrying case Instructional Video Instruction manual Optional Accessories: AC Adapter Child's Mask Specifications: Nebulization Rate: 0.4-0.5 ml/min Particle Size Range: 1 to 7 microns. MMAD approx 5 microns (1 to 5 microns for 80% of entire volume particle distribution) Medication Bottle: 7 ml (max.) Residual Volume: 0.1-0.3 ml Operating Temperature: 0 degrees to 40 degrees C; 32 degrees to 104 degr