Focus on the concealed curtain with handle bar in one piece. 1. Window lock: curtain operating device, and sliding channel are all hidden in the handle bar. 2. Original design of long and wide handle bar for easy usage. The stainless steel handle bar improves the overall superior touch with inner rubber to improve the comfortability. 3. Curtain insert between two panes; solution to the problems of the traditional curtain with exposure to air, dust and stains. 4. Double-pane window effectively reduces heat transmission between outside and inside of the house to maintain stable temperature inside of the house for energy saving and carbon reduction.