UPGRADED CORDLESS DESIGN: The cord-free design provides a clean, tangle-free look to the window and creates a safer environment for children and pets; it will stay at whatever position you stop ; the bottom aluminum bar is weighted and rigid so it hangs flat and prevents from wind blowing SMOOTH & QUIET GLIDE: Changshade robust constant force spring-loaded mechanism has passed 5,000 times usual lifting or pulling down tests for each blind and makes it easy to raise and lower the blind evenly every time and stay balanced automatically; it retracts and extends smoothly with constant force; our patented spring winder inside prolongs the lifespan of the springs, avoids the rebound or sagging performance and simplifies the mount of the blind BALANCE OF SHADE AND LIGHT FILTERING: In direct sunlight, they produce a warm glow and help the room feel brighter without sacrificing privacy; our insulated shades can keep out the heat from direct sunlight. Let’s in the right amount of light and block out the neighbors!