Powder ≤ 4 microns. The fine particle dose: 70-75% ≥ 0.30m/min evaporation rate. The particle size has consistency and accuracy that allow efficient respiratory treatment. Mesh technology. 20dB low noise rate. Portable designed (42 x 70 x 117 mm). Mouthpiece for adult and mask for child included. Compatible with rechargeable batteries. Micro USB port (for optional USB cable). Medicine bottle BPA-free.