【TOP DOWN BOTTOM UP SHADES】 With a push-pull automatic locking system, the cellular shades can be controlled up and down freely and stop at any height. You can adjust the light you need as much as you want by this tdbu blinds 【SOUND AND HEAT INSULATION】 Changshade customized top-down blackout blinds are built-in aluminum foil, which can effectively absorb noise. The unique honeycomb structure creates air pockets to provide insulation by trapping air in the cells to block harsh sunlight and UV. Great for home, office, and other places 【DELICATE CRAFTSMANSHIP】 The non-woven fabrics window shades offer a clean and modern look and are suitable for any room. After being exposed to the sun for years, the blackout blinds will still remain almost unchanged, without flaking, cracking, and fading 【NO DRILL NO TOOLS OPTION】 The cellular blinds have added no-drill option, which can be installed quickly in just 3 steps within 30s and won't damage the wall. Also we have tested the window blinds extensively and it holds firmly and will not slide down 【100% SATISFACTION GUARANTEED】Changshade offers one-year warranty, you can buy the window shades with confidence. We always think for customers firstly. Top down bottom up shades tdbu blinds cordless cellular blinds window shades blinds for indoor windows custom honeycomb blinds