About Product:1. Use clean, dry and oil-free medical air compressor; 2. Air pressure is 2.3-2.8 KGF /cm2; 3. Combine the quick connector with the connector on the bottom of the dental phone, and confirm that the lock is fixed; 4. Press down the pedals to check whether the operation of the dental phone and the spray of the nose are working properly. If everything is normal, you can start using the dental phone.