It's like cruise control for air brushers. The Model 200 offers the ease of single action operation while providing the fine spray pattern of internal mix atomization for professional results. Depressing the trigger releases a pre-set amount of fluid which can be regulated by turning a needle adjustment screw at the back of the handle. Once the desired paint flow is set, the air brush will maintain the preset spray pattern until you readjust it. The set includes medium air brush with attachable 3/4 oz. jar, protective cap, can of Propel, Propel regulator, 2 oz. jar with cover, head wrench, 6' vinyl air hose and instruction booklet.