Working air-pressure: 0.20Mpa-0.22Mpa. If the product is good. Your feedback is our motivation to develop our business and serve you better. Return within 60 days is accepted, though the item in good condition. The sale of this item may be subject to regulation by the U.Food & Drug Administration and state and local regulatory agencies. If you have questions about legal obligations regarding sales of medical devices, you should consult with the FDA's Center for Devices and Radiological Health. This dental items is not meant to replace your doctor diagnostic. It is mainly for your piece of mind and comfort. This item is in the category "Business & Industrial\Healthcare, Lab & Dental\Handpieces & Instruments\Dental Handpieces". The seller is "dentalskysea" and is located in this country: US. This item can be shipped worldwide.