This dual has a white switch, when you press the trigger and switch, it working and the air be sprayed out. If you return to the trigger, the liquid out and you can control the liquid freely. When you stop pressing the trigger, it stops working. Otherwise, there is an indicator light below the air compressor to show the battery capacity. Please fully charge the machine before using the . Fresh structure: stylish appearance, no holes in the machine. It's compact and can be taken anywhere. The lower pressure level is 20PSI, which is perfect for people who use airbrush makeup. The higher 27 PSI is designed for use in airbrush painting areas: model painting, cake decorating, nail art, crafts, temporary tattoos, etc. The uses a lithium battery, which can be used for 90 minutes after being fully for 40 minutes. Our airbrush set has a wide range of applications, including art painting, cake decorating, nail art, handicrafts, models, temporary tattoos, hobbies and more. With the multifunctional airbrush set and adjustable pressure device, you can get different decorations and paintings., Weight: 1.06262810284 Pounds, Manufacturer: tiyao