Crank Gear Operate Window 1. window itslef is a heat-insulation material 2. stop hot sun shine 3. cut down noise 4......

Crank Gear Operate  Window1. window itslef is a heat-insulation material2. stop hot sun shine3. cut down noise

4. energy saving

5. anti-burglar

6. anti-erode

7. stop peeper

8. durable

9. ...

JXY Crank Gear Operate Window