The airbrush must be attached to an air source or power supply. In this system, we offer two cans of 150 Feet of Energy for portability and ease. We also recommend air compressors for larger projects. To use the vFan Airbrush, push down on the trigger to start the airflow. With the trigger pushed down, begin pulling back to spray the paint. The farther back you pull the trigger, the more paint will come out.