1. The patent technologies enhance the performance of water penetration and air infiltration. 2. A Safety-Lock has been specially used in the product. 3. A warning label for falling prevention is stuck on the window to remind the users to pay more attention on child protection. 4. The concepts of environmental protection and energy efficiency are designed in products' life cycle. 5. The products provide the multiple options to fit all customer's requirements and specifications. 6. The products use an even more advanced design to help the worker glaze indoors. 7. The structure enhancer are applied at each junction section. 8. The gaskets of the product is well-known for durability and high temperature resistance. 9. The products are installed with a full-strip gasket, so that the quality of sealing around the window can be improved significantly. 10.To prevent the slight sag of the window after long-time use, a firmed roller is designed and mounted at the inner edge of the window bottom frame, and the fastened blocks are also used on the products to provide tighter sealing, and a better noise reduction. 11. With an attractive blend of contemporary and traditional design elements, the products use three-point locking hardware. 12. The extrusion frame of the product reaches 4.3 mm in thickness for the structural section. It makes the load intensity of the window stronger, and prevents the window from deformation after long-time use. 13. The water-resistant tapes are stuck at each junction place, the use of the water-resistant tape significantly reduces likelihood of air infiltration and water penetration. 14. The product is achieved by its unique 90 degree pivot stays, it not only gets a great ability to maximize and control the breeze, but also cleaning the outer glass easily and safely. 15.Original frame removal not necessary for installation of new window. Maximizes work efficiency while minimizing impact on surroundings and reducing cost greatly.