【20s tool-free install, 0-trace left】No Tools No Drill Design, easily installed in 20 seconds, no drills, screws or brackets required, perfect for tenants, landlords and families, suitable for a variety of wall surfaces, such as wooden walls, tiles marble, etc. Easy installation, making you more comfortable. Although our window shades are designed for drill-free installation, each set includes a complete drilling accessory kit as an additional option to meet diverse installation needs. 【How to Choose the Size】For internal installation: Window depth ≥ 1.42 inches. Order width = measured top width; Order height ≥ window height. After measuring your window width, just order the size that matches it. Simple: measure width, pick the same width. 【Cordless & Free Stop System】Our honeycomb blinds are easy to install，and cordless feature ensures safety for children and pets.Simply push up or pull down to position it wherever you want. 【Noise Reduction & Heat Insulation】Our cellular shades feature a double-honeycomb structure that traps air, retaining warmth in winter and keeping cool in summer, all while reducing noise for year-round comfort. 【Full Blackout & UV Block】 Our cellular shades, made of polyester with a honeycomb design & metalized layer, offer 100% darkness & UV protection for a serene indoor environment.