This kind of mini airbrush can be placed in your backpack or pocket. Model spray guns can be used for tattoos, art painting, cake decorating, make-up, nail, handicrafts, models, etc.
Just like a mobile phone, after a single charge, it can be used anywhere, even without a power supply. With USB charging cable, via computer charging, charger charging, or power bank charging. After a fully charged, it can be used for 30-50 minutes.