Drill holes in the aluminum alloy window frame, and the size of the holes is determined by the thickness of the cable. When drilling, make a slight downward angle to create a slight downward slope on the edges of the hole. After the cable passes through the window frame, bend it downwards to prevent rainwater from entering along the cable. After using for several years, I haven't found any water or insects entering. If you are not confident, you can seal it with chewing gum or toothpaste.
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