About this item 【Why Choosing "Boolegon" Branded Blinds & Shades】Over 20 years of history. These cordless cellular shades are made in our own factory and are subject to strict quality control. Boolegon robust constant force spring-loaded mechanism has passed 10000 times usual lifting or pull down tests. If the product occurrence quality problem within 12 months, we can free for you to make new products. 【Energy saving】The blackout honeycomb shades is made of non-woven fabric and polyester fiber fabric,shading, Protecting Privacy. Unique hexagonal honeycomb structure, built-in aluminum foil, can effectively heat insulation, heat preservation and noise cancelling. In summer, it can effectively block outdoor heat,and in winter, it can effectively store indoor heating, thereby saving energy costs. 【Cordless system】Cordless Cellular blinds for windows,easy to install and hang. The cordless adjustable design is not only neat and beautiful, but also protects the safety of children and pets. The accordian curtains are easy to use. Gently push up or pull down, you can pull the curtain to any position you want. Three types of opening and closing are available to meet the needs for light, privacy, or both. The honeycomb shades is suitable for living room,study room,kitchen,bedroom and office. 【Measurement instructions】Inside Mounting cell blind black out for windows require a minimum 2" window frame depth, blackout shades width need to be 1/2" less than window width. The blind need to be at least 2 inches longer than the window. Outside mounting cellular shades, the cellular blind need to be 4 inches wider and longer than window width and length for better coverage. 【Easy Installation】The order includes mounting brackets, screws, handles and instructions, and the product page also provides an easy-to-understand installation video. Can be installed quickly and easily, and removed quickly and easily.