Characteristic: 1. Original import brand compressor. 2. Readily adjust hardness, digital display and hierarchical controlling. The largest grade is up to 40. 3. Restart time adjustment and digital display, 3-9 minutes later, can adjust digital display at will. Controlling sensitiveness. 4. Wooden package. 5. These products have passed CE Certification. If you order this kind of products, we will donate poster and technology CD.