Nebulizer Esperanza ESPIRO generates the aerosol by the new mesh technology. Thanks to that, the soundless operation of the device enables your discrete use even with a sleeping baby aside. Thanks to the true portable size, the device can fit in any handbag or briefcase. This device is featured with 3 adjustable levels of nebulization speeds. Running up to 4 hours just with two batteries, your medicine is always within reach wherever you go. Power Supply: 2xAA 1.5V Alkaline battery ( not included ) / USB type C  (included) Power adaptor: Input 220-240 V, 50/60 Hz,  0.5 A & Out put: DC 5 V/1 A  (not included) USB type C:  80 cm,  5 V/1A Power consumption:  < 2 W Medicine  capacity: 12 ml Average Nebulization Rate:  >  0.2 ml / min Particle Size (MMAD): 2.3 µm  ± 25% 3 levels of nebulization speeds: low,  middle,  high Auto-clean ensures more thorough cleaning of drug residues hidden in the nebulization mesh. Operating Temperature Range: from 10°C to 40°C Operating Humidity Range: from 10% to 95% RH Storage Temperature Range: from -20°C to 70°C Standard package:  main unit,  nebulization cup,  adult mask,  child mask,  mouthpiece,  pouch,  USB type C cable, rubber protective cap Product size:  6 x  6 x 11 [cm] The compressor nebulizer should be used under the supervision of a licensed physician or therapist, a respiratory specialist.