Multi-lock point design The design of the mushroom head lock greatly enhances the anti-theft performance Ventilation It is good for ventilation in the case of falling inside, not afraid of general rain, and improves indoor air quality Not take up space Used in inverted state, does not occupy indoor space Prevent rainwater from entering The upper hanging state of the inverted window avoids the problem of rainwater flowing into the house due to forgetting to close the window on rainy days Multi-lock point seal Multiple locking points greatly enhance the sealing of the window Easy to clean Easy to scrub when opened inward