Dual action polisher, or DA machine(polisher) for short. Some people call it Dual action polisher and vibration polisher. The name is just a code name. The name is different.DA polisher rotates randomly, and the trajectory is an irregular ellipse. Advantages of Dual action polisher: high safety, no glare after polishing, and the surface temperature of the car paint after polishing is warm, not as hot as the surface of the car paint after the RO polisher machine polishing, even if you are a novice, you still have been riding for many years Old driver, choose dual action polisher is your must-have polishing artifact! And the mirror effect is better than the RO machine.