1.[ Cordless Cellular Shades] Our sheer shades are precisely engineered for blocking light and UV rays thanks to the blackout liner within the cellular fabric. They also provide noise reduction and can help save energy because of an inner 1.19 inch honeycomb structure that stays cool in summer and warm in winter. A bottom tab lifts and lowers the cordless balckout blinds to the preferred height. That perfect fits for bedroom. 2.[Upgraded Spring System] has upgraded the blinds spring-loading system. Its constant force makes it more easily to lift or pull down the blinds & shades evenly every time and stay balanced automatically. The blinds for windows retract and extend more smoothly and noiselessly with our est patented spring winder inside, which also prolongs the lifespan of the springs, avoids the rebound or sagging performance and simplifies the mount of the window blinds cordless. 3.[Features]To control light in the room easily by lifting the cellular shades with handle; Various custom color and size options for different interior or exterior decoration styles; Modern and Elegant look; Easy to install; cordless design very for ; Can be mounted on the inside or outside of the window frame; raising and lower smoothly and noiselessly. 4.[Measurement instructions]Inside Mounting cordless cell blind for windows require a minimum 2' window frame depth, blackout shades width need to be 1/4' less than window width. Blinds for windows length need to be 2 inches longer than window length. Outside mounting cellular shades, the cellular blind need to be 4 inches wider and longer than window width and length for better coverage.