Window opening limiter: Limits how far a window can open to prevent accidents. Ideal for ‑rise apartments and homes. Serves as a window fall lock and a sliding window lock. Childproof window lock: Safeguards by restricting window openings, reducing the risk of accidents in homes with elevated windows. Functions as a sliding door foot lock and a window opening limiter. Versatile application: Compatible with sliding doors, glass windows, and balcony doors to provide safety across different areas of the home. Patio door safety: Provides secure locking for patio doors, allowing a partial opening for airflow while keeping the door firmly locked. Works as a safety window stopper and a safety lock. Key benefits Reduces fall and injury risk by limiting opening range. Enhances child safety for homes with elevated or reachable windows. Broad safety coverage through compatibility with multiple door and window types. Allows controlled ventilation without compromising security on patio doors. Use scenarios Scenario 1: A family with young children living in a ‑rise apartment uses the limiter to prevent dangerous window openings while still enabling some airflow. Scenario 2: A home with large glass balcony doors uses the device to keep doors ajar for ventilation without creating a security gap. Scenario 3: The living room patio door can be partially opened for fresh air while the lock remains engaged, providing ongoing security for the interior space. Notes Compatibility includes sliding doors, glass windows, and balcony doors. Size and material are not specified in the listing.