Enhanced fly screen - 1 mm mesh openings provide better protection against small insects, with a hole diameter of 2 mm in comparison to many standard screens. This helps reduce mosquito intrusion while maintaining a clear view through the window. Easy installation - No drilling required. Quick setup with the included Velcro tape. Note: clean the surface and measure before installation. The window protector allows easy opening and closing after installation. Insect protection - Built-in insect protection grids help keep out flies, bees, mosquitoes and other small pests. This enables better ventilation on warm nights, helping you enjoy fresh air and healthier sleep. Wide compatibility - Suitable for various window types. Works with wooden windows, aluminum windows, steel windows, plastic steel doors and windows, or other window frames. After installation, the window can still be fully opened and closed. Use scenarios - Bedroom in hot weather: enjoy cool, fresh air at night without being bothered by insects. - Living room or kitchen: maintain good airflow during gatherings while keeping pests at bay. - Balcony or patio windows: use on multiple window types to reduce insect entry while you open the window for ventilation.