1. Fly Screen: We have enhanced the standard fly screen. The mesh size of our screen is approximately 1 mm, making it finer than conventional screens on the market (with 2 mm holes). This ensures mosquito protection and improved visibility. 2. Easy Installation: Simple to install with no drilling required. Just use the included Velcro tape (Note: Clean and measure before installation). The window protector allows effortless opening and closing of windows. 3. InsectResistant: Equipped with a protective mesh, it reliably keeps out unwanted guests like flies, bees, mosquitoes, and other small pests. Enjoy fresh air and restful sleep by ventilating , especially on summer nights. 4. Universal Fit: Our insect screen is compatible with wooden windows, aluminum alloy windows, steel windows, PVC doors/windows, and more. After installation, windows can still be fully opened and closed without obstruction.